Now I know why 904 was having issues

Creedmoor said

Thanks Beast. I've made a decent tool out of milk jug plastic. I'll keep trying. Back in the freezer again.

Click to expand...

I don't think milk jug plastic is stiff enough. (maybe)

A 1/4 inch slice off an old credit card would probably do it though if you smooth the edges so it doesn't hang up on the rubber and cut it.