[FTC]: Easy way to insert tank tread rubbers?

[blhenze]

When I examined the track, I found that about half of the track had a small bit of plastic on the inside that kept the rubber tread from being inserted. The good track was sorted from the track that had the extra plastic. We used the good pieces for inserting the tread and the bad pieces as between pieces in the track (every other track piece had an insert). Lego said they would replace the "bad" pieces.