How to Replace the Velosolex Solex Throttle Sleeve

How to replace the throttle sleeve (slow-down cam) on the Velosolex Solex models 4600 V1, 5000, and 1968-85 S 3800.

Velosolex Solex Parts for Sale:
https://velosolex4600.over-blog.com/2021/02/velosolex-solex-parts-for-sale.html