I have a 5 piece chisel set that I've had for 20 years (1/4", 3/8", 1/2", 3/4", 1"). Over that time, I have sharpened them incorrectly many times and have lost the original bevel angle. I did a Google search for this and came up with 25 degrees, but this seems very steep. Also, is the angle consistent for all the chisels? I want to do it right, so I'm looking for help here. Thanks to all.