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Old 02-08-2018, 02:39 PM   #1 (permalink)
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Help me get industrially screwed!

Howdy!

I have a screw that comes from the rear sight of a goofy Italian revolver. It looks like this:







The issue is it needs to be longer. With the sights adjusted to POI, only about one thread is locked in. This caused it to back all the way out under recoil, launching the sight's spring into the stratosphere.

I don't have a nut on hand that matches but my calipers have the threads at 2.4mm and change. My guess is that this makes this a M2.5 thread so I ordered a few nuts off Amazon to verify. The bigger issue is the underside of the head it's dimpled because it locks into a ball bearing to give "click" adjustments.

- Anyone have a good source for rare and exotic screws? Even more exotic than Fastenal?
- Whattabout tiny, tiny springs?
- How the hell do I even describe this thing?

I'm gonna go out on a limb here and say that these probably don't exist out in the wild and I'll have to Dremel Fu something instead...
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Old 02-08-2018, 02:49 PM   #2 (permalink)
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Looks like a rear sight elevation screw. Take it to a local hardware store and try on a few different nuts until you figure out exactly what threading it takes. Then you'll probably have to call a few online stores until you find someone who has it in stock. Shouldn't be too hard, though.
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Old 02-08-2018, 02:57 PM   #3 (permalink)
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https://www.gunpartscorp.com/

https://www.gunbroker.com/Collectibl...sories/BI.aspx

That should get you started... If you can supply the make and model of the firearm, I may be able to locate the exact part you seek.

Ty
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Old 02-08-2018, 03:18 PM   #4 (permalink)
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Chiappa Charging Rhino 60DS.

If you can find it, you're doing better than the manufacturer. They offered to send a replacement sight when they get one. In 30-90 days. Because Italy. It wouldn't even solve my problem since I'm trying to find one that's longer than stock.
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Old 02-08-2018, 03:19 PM   #5 (permalink)
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Looks like a rear sight elevation screw. Take it to a local hardware store and try on a few different nuts until you figure out exactly what threading it takes. Then you'll probably have to call a few online stores until you find someone who has it in stock. Shouldn't be too hard, though.
No go on the hardware store - the smallest they get is M3.0.
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Old 02-08-2018, 03:44 PM   #6 (permalink)
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If you can find the right sized screw you can add the detents around the rim with some very careful drill press or vertical mill work. It would not be a cheap job to do but if it is the only option......
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Old 02-08-2018, 04:09 PM   #7 (permalink)
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You wouldn't happen to have the Chiappa part number?

The part *might* be available through their online parts store... Chiappa Firearms - PARTS - HANDGUNS -

Ty
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Old 02-08-2018, 04:19 PM   #8 (permalink)
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It's not. I've been in contact with them directly already and they were their usual, completely unhelpful selves. It doesn't even have a number on their part diagrams.

And again, I'm trying to get something longer-than-stock that I can file down to fit.

Truthfully, I'm tempted to pick up a standard threaded screw and tap the hole. I can go a little wider without any fear of cracking the frame since the Rhino shoots from the bottom.
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Old 02-08-2018, 08:05 PM   #9 (permalink)
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My Crosman 600s have a long version of that, I'll pull one out tonight and measure it.
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Old 02-08-2018, 08:06 PM   #10 (permalink)
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Truthfully, I'm tempted to pick up a standard threaded screw and tap the hole. I can go a little wider without any fear of cracking the frame since the Rhino shoots from the bottom.
If it were me, I'd order a longer one of the right thread and carefully file notches in it.
Or if you have access to a lathe, get a long screw or some allthread, bore that one out, and silver-solder a piece in.
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