I do NOT think any sort of springs should provide the limits in the ESA, instead the shape of the cams must be steep enough to grant a progressive action. That is why I used the idea from the BMW design modified for three cams for the Vincent engine. They had this type from the fifties in all bikes for a reason up till now so that could be called tested and approved. My contribution in the Robinson cam thread regarding ESA design should better have gone into a more suitable place like here, maybe the moderator could shift that as he likes.
Whoever responsible for machining, designing or modifying spare parts, I hope they read these pages occasionally to bump into ideas worthy of consideration. Sorry for not knowing whom to contact first, I just wanted to start some discussions and maybe later we might come up with more radical ideas for promising improvements . The factory design is now more than half a century old and to this day drivers are still faced with same old calamities from day one. Somehow most motorcycle companies seem to have copied the same (wrong) design more or less, pairing very strong springs, single or multiple, with way too shallow cam design. The result is miserable, springs hitting block length plus shocks sent into the primary drive. Springs shall not suffer block compression, breakage is the price. That is why the proper progressive stop has to be the cam set in the ESA, not the springs.
Some more pictures that I did not post in the camshaft thread, but related to ESA:
Vic
P.S. I will happily ship my alu test pair for studies and hopefully used for designing new ESA sets suitable for driving tests.