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Try https://www.mdinaitalia.co.uk/

I usually get belts from RS but recently some of them were a bit tight causing a whine. Sometimes this does resolve after a few miles done. Both my bike are now running B pulleys to make life easier.
An alternative is to get a belt from Mdina Italia, graded for your pulley.

There is half a story that they may reappear. I have BT 46 and Avons on my road bikes and have not noticed anything untoward.
Most recently I ordered a tyre from a supplier. Paid to get it fitted however.

A smear of loctite on the spigot threads won’t go amiss if it come loose again.
Assuming flat slide carbs are the slides showing wear?
Are the carb tops on the right way round?
The highest part should face towards the engine.

I use BT46 or Avon Roadriders.

Glad it is sorted- that photo was not of mine , just seemed clear. Mine shows the usual mix of age and “deposits”.

My understanding is there is a clutch shim washer, too thick and the clutch drum can bind on the centre hub.
Mdina do seem to have these listed under clutch shim 0.9 ir 0.7mm. Needs a bit of trial and error.

Also see Vital Parts Uk. Think Mike Smyth has some knobs on ebay too.
I always have a bath tap washer 3/4 inch glued onto the frame then a smaller tap washer on the knob- they never come undone.

If I was refitting the pickup from scratch I’d want the cutaway to be facing at about the four o clock position. See fig 23 page 23 of the Blue book. These magnets can get cocked on the shaft when removing so try and avoid that, or you will break into a sweat. Also see https://m.youtube.com/watch?v=...

E17 needle, clip on 2nd position should be correct.
What atomisers are you using?
The jets will also wear, they are cheap though.

I had a bit of experimentation with home brew nickel plating a year or so ago.Bit of a lash up. Mainly tried it on wheel spindle exterior ends and the caps on pillion footrests. There are commercial DIY kits for metal plating too. You have to have clean grease free metal whatever way you go. Disposa...

That is really interesting. All the technical specs I have seen always quote an upper temperature of 100 oC. Of course that may merely be as far as they test to.

BT46