Cheers Rupert. No evidence of one on my B21, probably rotted away sometime last century. I can't see how the leather washer at Drags would do the job.

The 1939 parts book for B21 to B26 lists 65-3087 'leather gland' and 65-3088 'sprocket spring ring'. I'm guessing that these were fitted behind the gearbox sprocket perhaps to prevent grit etc flicking off the chain and getting behind the sprocket. These parts appear to be no longer available, but Draganfly shows a leather washer instead of the 'gland', available on back order.
Has anyone had any experience of these parts? Could a felt washer be a suitable replacement as fitted to many later models?

Hi Kevin
I think the clutch chainwheel is 65-3919 available on ebay today.

It depends on what you're looking for.
The basket is the same as on a C10 but a quick look didn't find one
The metal plates are common with many BSAs and are readily available
The driving plate is also a common part and available
The chainwheel is the same as on a C10 and Burtons have them.
Hope that helps

Hi Guru
I've just fitted one to my 1939 B21.

The first question is, do you have a lifting handle? If not, you'll have difficulty.

Replying to my first query, it was the end of the rocker spindles that the union bolted onto. Once apart, I found that the two rocker springs were significantly different when they should be the same; new ones on order. In addition, instead of having a spring on one side of the rocker and the thrust washer at the other, the exhaust rocker had the spring and thrust washer together and no washer at the other side. My theory is that by having both spring and washer together it moved the rocker along the spindle allowing excessive oil to exit the spindle groove and make its way through the spindle/rocker box interface. This would also result in reduced lubrication of the exhaust rocker; not a good idea.

Ok, so it's a BSA!
I've got the B21 back together and started and warmed it up. I noticed smoke coming from under the petrol tank and found oil fizzing from the rocker oil feeds. From the outside it looks like there are steel inserts in the aluminium rocker box which the union screws goes into, but are these the ends of the rocker spindles? If so, should there be some sort of sealing washer inside?
Secondly, there was a steady drip of oil from the primary case. When I removed the level screw, half a cup full of oil came out. I'm assuming that this is engine oil from behind the engine sprocket. Again, any comments would be appreciated before I investigate further.

Agreed, but no longer have access to a lathe nor do I have the two dies needed. The main problem is that a previous owner has knackered the thread on the end that goes into the frame. Goodness knows how he managed to do that. Probably cross threaded it by trying to screw it in with the spring already under tension. I've bodged it for the mo by applying epoxy to the thread and just screwing it in finger tight. Its firm and everything works, but I hate it when a jobs not properly done.

Thanks Glenn
According to the parts books, this particular spindle was fitted to a number of Bs plus M20 and 21 in 1939, then B31 and 33 in 1947 and 48. After that the Bs had 66-7029 which is currently available.

No replies so have added a pic to aid recognition. I suspect that if there are any around they'll be pretty knackered.

Pages 142 and 143

These screen shots are from the 1932 parts book. Not an exploded diagram but hope it helps.

Any suggestions on finding a M20/21 rear brake spindle 66-7035? I think it was also used on some early B group models.
Tia

Engine and frame numbers WM20 70000 onwards were produced in 1942 .