you are using glue? There is a tip in my new book on lulu that gets around this problem. ( in fact there are loads of tips hidden in it)
If your constructing things that slip over other things, always use tape, never glue,because your gaff will slip over right to the edge.
Dont use double sided tape, because thats just glorified glue on a roll, but use good old fasioned sellotape for speed, and micropore tape for best.
this is a thin, white woven fabric tape, and is great for making up small card gaffs.( buy it in boots)
but for full sized card gaffs, i find that white printer labels are great, and give a nice slippy surface for the other cards to rub against.
