Booster 55 Rocket Build, Part 2, Removing the Staging Funnel

This was the trickiest part of the build. The funnel might be fine at ejection but the bulk of the charge would be compressed into a 1/4" hole.

I got out my ancient Dremel tool and attached a sanding drum. Most of the funnel was ground out.

On the left is the funnel after grinding. Most all of it was melted and easily cut out with a knife.
When is was removed I could see the glue on the side walls. I might have been able to knock out the funnel with a hammer and dowel. But then again, I might have broken the fin can.