Score it with a wire cutter, then bend back and forth until it breaks off. File off any rough edges.
I made a bent a slight curve into the engine hook.
The extra tension makes for a better hold of the engine.
Some history:
The top picture is from the Estes instructions.
Notice the engine tube is 3" long, the hook extends 1/4" over the low end.
A couple joins the engine tube to the longer upper tube. The coupler also serves as the engine block.
This design was first used in some minimum diameter Centuri kits. This instruction illustration is from the Scram Jet.
Gluing an engine block in the correct position (by sliding it into some glue in the tube) has always been iffy, especially for first time builders. Gluing a coupler in a shorter tube from the top does two things. It easily places the engine block in the correct position. The longer engine block works as a coupler joining the two tube lengths.
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