Well, I don't have a Compensator, otherwise I would be building that. I do however have 2 sets of cores for the compensator along with a glass fuse that my dad is not sure what it is for. I've always thought it was a Tiger Tail fuse, my dad just refers to it as a glass-fuse version of the Compensator. We probably still have the plans for the Compensator somewhere in one of our many boxes, with that and a set of cores it wouldn't be too tough to build one.