I started out with an Egli which has the engine higher and the seat lower than a stock Vincent. As a result, I indexed the KS to never hit the stop. This allowed the most powerful part of the leg extension to happen exactly when the engine needed the most speed. When I got a stock Vincent, I did much the same. I have watched owners start the bike on the stand and considering that the KS hit the stop when just below the pipe, I understood why they had to climb up so high. Based on my experience, the starting is much easier the further away you are from engaging the stop. You might do some experimenting and set it where you can start it with the least effort. I will also admit that probably 80% of the Vincents I saw and owned had the stops smashed out of the case. As a result, I did not rate it as an effective design and avoided treading in that area. In the ensuing years I never had an issue with any Vincent that I owned, so I decided it was probably a perfectly good design and it was simply prone to abuse.
David