The MK bellcrank set up is probably a couple of ounces more weight than
a good carbon fibre pushrod set up, and since it is made of plastic there is
the potential for flexing. I've got two of them working and haven't seen any
problems yet but I do think when I build my next airplane I will use the
double .070" carbon fiber pushrods. Less linkage to hook up and less to go
wrong although the initial set up takes a little more time.

tommy s