I've been trying to get my Rainmaker to seal for a while and realized that the cupseal was shot. I got my hands on an Inception designs cupseal (the 9/16's one). The seal is close enough to the original seal except that it is short on length on both the valve stem and the seal itself.
It unreliable seals on it's own so I had to make a valve guide. I used a desktop cnc router to make them from glass filled nylon. Both the round and ninja star styles work and when testing, I didn't see a noticable difference in velocity. These guides are also thick enough to match the same thickness as the old seal.
To compensate for the shorter valve stem, I spaced the carrier at 2.245". I'm sure if you are currently doing MadMarty mods you can just leave more threads exposedon the threaded post to make up the difference instead of moving the carrier.
After doing this, the gun seals and reliably fires.
Just wanted to share some info and hope it helps at least one rainmaker owner.
It unreliable seals on it's own so I had to make a valve guide. I used a desktop cnc router to make them from glass filled nylon. Both the round and ninja star styles work and when testing, I didn't see a noticable difference in velocity. These guides are also thick enough to match the same thickness as the old seal.
To compensate for the shorter valve stem, I spaced the carrier at 2.245". I'm sure if you are currently doing MadMarty mods you can just leave more threads exposedon the threaded post to make up the difference instead of moving the carrier.
After doing this, the gun seals and reliably fires.
Just wanted to share some info and hope it helps at least one rainmaker owner.
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