OP
Bigeclipse
Contributor
Mine uses a hex bolt on one side and then another hex bolt (but a holow hex bolt) on the other which accepts the front hex bolt if that makes sense. So you use two Allen wrenches. When tightened all the way down...the button will not be allowed to depress/move.You fully tighten it. The system is simply a bolt and a nut, hex bolt on top, some kind of nut on the bottom (they keep changing the nut). In between is the shaft, 2 O-rings, and spring.
Lube it with silicone (no petroleum product) and make sure you put it back together correctly. It should move freely.
SiTech drysuit exhaust valve disassembly