Originally Posted by
svtmike
I see at least one potential good product from OP's work -- the lower pulley that won't blow up the derailleur.
Curious why a chain keeper over the top of the chainring rather than behind wouldn't be more effective.
Pully gear tooth profile and involute shape have been carefully developed by countless tolerance stackups and dynamically modeled on CAD with all possible gear combinations. That is how pulley tooth shape evolved to its present state. But there is more. Pully shape isn't just about X-chaining capability...it is about gear shifting efficiency and also propensity for pully wear due to reducing tooth cross-section. Countless hours have gone into the evolution of pully tooth shape and any modification of this will have consequences to parameters other than X-chaining capability.