In a message dated 24-Aug-99 12:39:18 Eastern Daylight Time, Ct54531@aol.com
> Also, I had the impression that the 4 and 4A slaves were the same but that
> the 3 and 4 were not. Was there an overlap with late 3's and early 4's but
> most of the 4's have the samee as what's on the 4A?
Looks as if possibly some late TR3A's (Piggott shows a slave cylinder and
bracket "upgrade" in '61 at TS71372E --btw -CT82346 was the last TR3A) and
definitely the TR3B and the TR4/4A were the same. Good pictures of the
earlier and later salve cylinders in the Haynes manual. The later slave
cylinder has a larger diameter (because they wanted a lighter feel?). All
the slave cylinders were mounted in approximately the same place.
My guess is that the one you are looking at could be the later one (based on
what I said above) but suggest you check with BPN (from what I remember from
the list they are reputable).
Hope that's some help. Cheers.