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Old 01-16-2012, 11:39 PM   #1 (permalink)
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No more TPC set-screw!

I know I'm not the first to do it, but I just wanted to put it out there w/ a pic in case anyone else would be interested.

After playing w/ phantoms for over 6 years and getting sick of changing out set-screws, I decided to do this mod. I "created" a Set-screw-less Bolt by modifying one of my TPCs to hold a 009 o-ring which creates just enough friction on the threading to hold the TPC in place to prevent velocity-creep (ie: via a worn out set-screw) but is loose-enough to be adjustable w/ the velocity adjuster. I'm sure over time it will wear down and loose some of it's friction, and I am interested to see how long it lasts.

Giving credit where credit is due, this mod was obviously modeled after the ASP TPC, and if they ever have any of theirs back in stock I will definitely pick one up. Depending on the "field-testing" results over the next couple months, I will likely do this mod to all my Phantoms and guns w/ Phantom internals.

SIDE NOTE: I think a 010 o-ring will probably be a better fit since I had initially designed it for a 012, but it was way to big and the 009 was the next smaller size I had. Ironically IT WORKS GREAT! LOL... You can see the two different sizes next to each other in the picture as well as a stock CCI TPC and my modified TPC (on the right) w/ a VERY tightly fit 009 o-ring sitting inside the threading

Another side not: If I do this again I will likely put the o-ring one thread closer to the front of the TPC, as it's current position only allows 3.25 turns in from it's forward-most position before it looses friction against the Bolt threading - effectively limiting the range of adjustment.

Hope you guys get some inspiration from this thread...

Short

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Last edited by short304; 01-16-2012 at 11:48 PM.
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Old 01-16-2012, 11:58 PM   #2 (permalink)
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What did you use to cut the slot for the oring?
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Old 01-17-2012, 12:08 AM   #3 (permalink)
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What did you use to cut the slot for the oring?
I'm actually a little embarrassed to say it but I used a Dremel tool cutting wheel because I don't have access to anything other than that currently and figured it didn't need to be anything super-precise, as long as I did it carefully.

I wrapped a piece of tape around the threading to mark off a straight line in the threading. I VERY CAREFULLY and slowly cut along this line into the threading, cutting deeper and deeper with each rotation until the 012 looked like it would fit, when I had cut down to a the depth of the inner diameter of the 012 o-ring (.380in I believe it was), I decided I couldn't go any deeper w/o the o-ring rotating, so I tried the 009 o-ring and it fit great (tho a little tight ), and when I threaded it into the Bolt it was the PERFECT amount of friction... but like I said, I think an 010 might be a better (over the long-term) fit.

I know that anyone w/ a Knee-mill could do this more precisely; I'm sure Ryan w/ SSC could do something similar for a pretty fair price, but like I said, I recognized that w/ a little patience I could get the results I needed (even though under the o-ring might not be as pretty ).
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Last edited by short304; 01-17-2012 at 02:22 PM.
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Old 01-17-2012, 10:59 AM   #4 (permalink)
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very cool!

i could help ya... wouldnt be too hard to do on a lathe
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Old 01-17-2012, 12:09 PM   #5 (permalink)
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very cool!

i could help ya... wouldnt be too hard to do on a lathe
Yep, that's what I figured... to be honest, I might send this one to you to use as a "model" and have you do all my others... I currently have 5 sets of phantom internals. Maybe move the o-ring groove one full thread forward though...
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Old 01-17-2012, 12:31 PM   #6 (permalink)
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easy peasy
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Old 01-17-2012, 01:08 PM   #7 (permalink)
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ASP is doing this with a lot of his new TPCs
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Old 01-18-2012, 01:08 PM   #8 (permalink)
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I have 4 phantoms, a drill press, a dremel, diamond cut-off wheels and some questions:

My drill press is variable speed, what speed should I set it to when cutting metal? when polishing internals? Speed ranges from 570 to 3050 rpm.

When I put a tpc/bolt/hammer/whathaveyou in the drill's chuck, should I worry about marring/deforming the metal? should they be wrapped/sabot'ed in something to prevent the chuck from effing em up?

Should I use the diamond cut off wheel to cut the tpc? or get a fine metal file (i'm leaning towards the file, but I have the diamond wheel on hand and I'm poor)?

What other fun things could I do to my phantom with my drill press?
I already have open face tpcs, lightened hammers and a leprechaun valve.

Should I polish all of my internals? I've long resisted this--I see it as a fad, and I am concerned that it would ruin the finish on the internals.

Most of my tools are diamond coated because I am a jeweler and I cut glass/shell a lot. I think I need some basic tools for working with metal. I do have a 1/8 npt tap and a correct drill bit, but they are 1000+ miles away from my drill press.

Any one in Austin, TX that needs some drill time should get in touch, I'm more than willing to share.

I think with a few more hand tools I can do a lot of cool mods to my phantoms. Thanks for the input and advice.
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Old 01-18-2012, 03:29 PM   #9 (permalink)
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Put the whole TPC in a drill chuck. A drill press is ideal but a drill in a vice works.

Spin it and use a very fine file or dremel cutting disc to put the o-ring groove in the TPC. Remove regularly to measure the depth of the cut.
File won't work well - you'll keep catching the thread. I use a parting tool to groove the TPCs (not the greatest, I should be using a grooving tool), and I even get a little wobble on that as the thread tries to push it around.

Use a cutting disc in the Dremel while _slowly_ rotating the TPC for the best results if you're trying to do it by hand.
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Old 01-18-2012, 03:31 PM   #10 (permalink)
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and if they ever have any of theirs back in stock I will definitely pick one up.
They're out for plating right now, but in a pinch, it looks like your mod turned out quite nice!
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