Tony,
First of all, it would be helpful for us to know what model we are talking 'bout, from your last post I assume it is a s'arm model? If so, you will need the following parts (using BSA numbers and part names):
67-5021 Adjuster (rod + bakelite knob assembly)
67-5328 Screwed collar (the bottom nut, visible in my pic)
I think that's what you have already.
24-6035 Lockwasher (goes on the rod, between the bakelite knob and the chromed top nut on the top yoke)
65-5380 Washer (friction disc, only one fitted between the anchor plate and the bottom yoke)
42-5014 Anchor plate
25-5247 Star washer
You need bolt 28-2338, nut 02-0049, washer 02-0923 and lockwasher 36-0382 for fixing the anchor plate to the frame. If memory serves me right this would be a short 5/16" BSC bolt.
Cheers, Markus