Someone who has a parts list or know which twist grip it should be in civilian pre war M20 and M22?

If you google bsa m22 and then click images , you will see the correct one, cornucopia sell them £100 plus they are in Germany I have an original on my 1938 M22 sport and cornucopia's are very close , hope this helps

email (option): garypitt@talktalk.net

* The 2 spiral slots on the tube mean the inner cable AND the Bowden outer move toward each other. If you see a tube with just one spiral it's not a throttle but advance/retard (left side) twistgrip which is made to move only the cable itself.