Redux pierce-pin assembly: cut threads & LIQUID seal
EDIT - See the post below; looking for more info on the liquid seals.
I had the Redux completely apart yesterday and had some spare pierce pin assemblies on hand which I think were standard CCI's.
The CCI's had about twice as much threading as needed for the Redux so I cut them down.
More accurately, PMI 3 cut them down with his razor saw!
If they were left long, they would interfere with the cup-seal or valve spring. Cut cown, they fit perfectly.
Shown below is the DD68 Redux valve and the cut pierce-pin assembly that came installed as well as an uncut CCI assembly. NOT shown: the o-ring that seals the assembly and acts as a spacer. (don't omit that o-ring or you'll likely have a massive leak on your hands!)
From the valve insert thread, the second photo shows the total length of the pierce pin assembly, subsequent to cutting it down.
I blew out my first pierce-pin seal today, dumping a near-full 12-gram. It was a CCI seal on a backup assembly identical to the Redux assembly except the seal.
The Redux pierce-pin seals are silicone rubber installed as a liquid. I've never blown that seal yet.
Mongo posts about this here:
Here's a photo of the DD68 seal, clearly showing a meniscus formed when the silicone was poured:
I'm compelled to get a few more assemblies and make my own using silicone.
Interesting, mine is just a stock CCI pierce pin/seal. I have heard from Steve that he can use silicone as well though.
a buna o ring will work just fine. that what i used to use in m sheridan valves.
yes the pierce pin side.
rather than buying a new seal from palmers which would cost oooodels, i threw a buna o ring in there and it has never leaked. nitrile stands up just fine to Co2.
Liquid Silicone PiercePin seal
One more thing- this arrangement is MANDATORY on a slamchange grip for a Redux or a dd68- you'll not have to worry about "blowing your seal out" when short changing 12 gram- and, again, it lasts a long, long time!
I picked up some aquarium seal the other night and tried it but the one I got seemed very thick. Even heated to about 212°F/100°C, it stayed somewhat solid and difficult to work.
Necessity is the mother of invention and I had an unopened tube of McNett "SeamGrip", a clear, liquid urethane sealant I decided to try. Without much heat, it pours like corn syrup and it's resistant to extremes of heat and cold, helpful when dumping a 12-gram into the seal.
I'll let you know how it works out. Failing that, McNett makes "SilNet", a similar but silicone based sealant.
UPDATE: SeamGrip FAIL!
Fail fail FAIL!
All aboard the failboat...let's go FAILing!
Dumping a 12-gram blew that stuff right out of the assembly, cutting a nice slice in it.
Back to the drawing board... have to pick up some SilNet silicone sealant and give that a shot.
I tried a new approach: a bit of JB-Weld behind a standard CCI pierce-pin seal.
Acid test: I dumped a FULL 12-gram into the pierce pin assembly while installed in the Redux.
No blown out seal!
I'll report after testing this during some games.
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