I may not be the best advise but I would think a tapered pin and seat would be better. Assuming you have the capabilities to hold tolerances. And I'm sure you do
. I would think the hard part would be getting the right spring. I've been wanting to make one myself and have just assumed a taper would snap and flow better than a round bearing surface. ill be following how you make out so my learning curve might not end up with more parts for the recycling bin.
. Appriciate you posting your progress good or bad.