Simple technique:

Leave the clasps about 15 – 20 mm longer so that you have enough to embed in the first layer of your flask and expect it to stay in place during boil out and packing procedure.

Block out the clasp where it engages the tooth and as far to the interior as you can to give it room to flex. I use superglue and zap-it to do this. The superglue pops right out after processing leaving a small channel for the clasp to flex into.

After processing cut back the excess clasp and viola… an economy flipperpoise or poor man’s TACH EZ or IC attachment or whatever.