Fingers crossed it'll cut ally

[blackburn mark]

some developments :) another 4 pads to make and im ready to give them a try

its probably wise to keep the lose air to a minimum, small bore pipes etc that way you can pull a harder vacuum
i will be using a one way valve between each pad and the manifold (makes sense if you think about it)
iv oppted for the 35mm o-ring size for now they have a good holding force but not enough to bend/warp 2mm alli (i think) i may make some 60mm pads for heavier material cutting if these work out well
the glue im using is the heat type, iv had no leaks so far :)
you could use two o-rings (one smaller and inside the other) to clamp over holes
you could make up some exelent kits with this stuff
but we will see when it comes time to do some cutting on them