One new #64 rubber band has always worked OK for me except for the time I forgot to attach it to the hooks[]

It is not particularly effective lying on the bottom of the fuselage. I got distracted in my assembly sequence because one of the aileron extensions slipped down the hole, and I forgot where I'd got to.

A wing came adrift just after take off, resulting in one of the quickest rolls I have ever seen.

Fortunately despite spectacular crash the plane was repairable.

Terry