The caul is awesome but didn't come about as a plan. It started out as just the part on the right which worked great for reflexing and recurving, but I soon realized not being able to get your tip alignment and reflex at once sucks. I am NOT a fan of heating wood more than 3 times. Anyway, after whipping up a counter part to the first caul I realized how I could adjust it like this for different profile shapes. Very handy.