Unless it's an earlier model A-4, in which case it didn't come with the 4:1. This is where the bushing/plate was used. On Mon, Dec 26, 2011 at 1:43 PM, CL in NC <mjcal77 at yahoo.com> wrote: > Thanks to Dave Knepper on his input to the missing 75A4 main tune 4:1 reduction drive and shaft bracket via email and phone.