How much should the angle of veneer fixer be adjusted?

See which foot you are in the front ~ ~ Generally, it is 20 degrees from the front foot to the back foot 10- 15 degrees. My forefoot 15 degrees, and my hind foot is basically flat at 0 degrees. In fact, the key depends on how comfortable I am ~ ~ Some people's feet are 0 degrees ~ ~ and their skills are also very good. So the angle has little to do with technology.