Hmmm... not as simple as I expected. I decided to make a spacer(s) and it took over an hour. But most of this was thinking time.
First find some thin metal that can be cut with scissors. I used .009 inch stainless steel sheet. A coke can is probably similar. I don't think it needs to be conductive but if you want guaranteed conductivity then you will probably need to sand the coke can to bare metal.
Drill a 3mm hole in the metal.
Now - and this is the important part - cut the metal as close as you can possibly get to the hole. If you look at the top of the vamo with the 510 screw removed, you will see a definite circle a bit larger than the screw head. The screw head is about 4mm.This is what we are aiming for. I think there is a slight slope outside this circle - this kept giving me "low load" errors when my spacer had too large an external diameter.
Repeat the process. I have 3 spacers in my vamo, it fires my iclear, and there is the slightest of gaps between iclear and vamo. There's a much larger gap with my
kayfun 4 which is what I needed this fix for.
Put spacers on 510 screw and tighten as tightly as you dare.
This vamo is an absolutely stupid design. You have to adjust a 510 screw to accomodate different attys and the screw moves as you take attys on or off. But I am now a happy bunny cos my fix works for me. I wonder how long it will last.
The reason I said above that conductivity is probably not an issue with the spacer is cos my first attempt was a nylon spacer that fitted perfectly. This allowed my ego threaded pro
tank 3 mini to fire (for the first time), but was too deep to allow a 510 to screw on.