Hot wire (12v transformer and some high temp wire) or this handy tool will cut through foam rubber like a soldering iron through a candle the trick is to find the right density. The butt bun should be very firm or a thin low density pad over the supporting bun. https://www.amazon.com/Knife-Cutter...ocphy=9031089&hvtargid=pla-407981769068&psc=1
