I'm unfamiliar with The Snail pump, but can help w/TheVV. Others have used different methods, but this is how I modded both my
X40 and
Goliath models:
1. remove entire
BM valve assembly so you're left with a cylinder w/a
gaiter and a hole at the top
2. take the VV stopper and put it in the top of The
BM where the valve used to be.
3. wedge a small rubber washer or similar to create enough compression to keep the VV stopper in-place
4. fill your
BM w/water and mount it just like normal, once semi-secure you can use the hand pump to the desired pressure