Hi Brian,
I have a single drawing from Woking precision models circa late 70's
It is for the potts attachment you see in my picture with this message.
If that's the one you are making send me a P.M. and I'll get it to you.
Actually your name is familiar, did I sell you some potts castings for the pedestal design?
If so you may still have my email address, have a look.
geoff w