My two KX 170B NavComs are getting a bit tired. The tuning gears have been
replaced, and after several years are now getting really stiff and hard to
turn again. Apart from the mechanical parts, the radios both work just
fine.

I am looking at three alternatives; having them repaired again, getting the
MAC 1700VTX conversion, or replacing them with TKM MX-170B units. The
conmversion and the TKM units seem to be about the same price.

What is the collective wisdom of this newsgroup? Does anyone have direct
experience with both the MAC and TKM products?