Replacement of knob

[Sharpco]

Maybe it will be off topic, but which sharpening angle do you use? to have this kind of problem.

It depends on width. Generally over 20 degrees.

[mat450]

when you flip the jig to when the knob faces down, using sharpy mark position of jig on blade, then undo jig and flip so knob is facing upwards and tighten jig same place on blade.

I do this method on thick blades to get even bevels