Karl's V20 variable seat angle solution

[Karl42]

Which has me thinking looking at the specs of the hinges why not use a second one instead of the metal hasp? Then rather than have the strut central and over the frame member, could have one either side what wouldn't impede on the original seat angle??? I should rig up a test thing to see if it can work...in miniature of course.

The 5 inch metal hasp feels a bit overbuilt for this, but it provides a lot of stability and feels very solid. I also have the original 4 inch hasp from Sea-Sure that @Pcmousley used for his project. It weighs 55 grams. The one I use currently has a 5 inch arm and weighs 85 grams. The Sea-Sure one is a bit flatter and would probably still be strong enough, but the longer one just fits perfectly in the existing hole in the frame where the screw for the perez clamp is. The shorter hasp (or other hinge) would have to sit a bit more forward, just above where the frame has a big hole. I thought about constructing something with the alu plate to mount the hinge in the hole, but the current solution is just so much simpler that I went with this one for now.

Using a second carbon hinge for the seat support sounds interesting, but sounds like much more effort, because the carbon hinge itself is very small, so you would still need to make the strut (or struts) out of something. If you make a up a test rig for this I would be interested to see it.

I am more than reluctant to cut my seat...to which I think I'd like to get a spare save ruining the original??

I hear you. I actually found and bought a used V20 seat for this reason, so that I have a spare in case this project doesn't work out (and then I still had it lying around for a long time before I actually got the courage to cut my seat - which turned out to be much easier than I had feared).
Given the number of riders who replaced their stock seat with something else, you'll probably find one of those seats for sale here in the forum if you ask for it.