Losi bellcranks with metal inserts?

[aconsola]

I got a lot of parts today, and these were included. I do not recall ever seeing bellcranks with metal inserts, anyone know anything about these? were they standard on the jrx-T like this or was this an upgrade part?
Thanks!

[wyldbill]

wow iv'e never seen thoes either. but im guessing the bronze or brass inserts are to act like a bushing to keep thoes massive truck tires and the additional leverage they created from chewing up stock ones. look to be a rare item indeed.