Another thing you can do is when you get plastic parts with kits, before you cut them up, pour plaster of paris in to them to make a plug. This may save you later down the road; either money ('cause you won't need to pay $15.00+ for a canopy) or if the kit is no longer available.

Plaster works great for plugs, no release agent is needed. You probably will need to tap it to get the air bubbles out after pouring the mixed plaster into your master. I turn on the scroll saw and rest the mold on top of it and it does the work for me.

Daren