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LockOn, Balrog,

+1 on DLBs explanation, which is much clearer than mine :)

A lot of straight razor shavers use the 20 - 30 degree angle when shaving :)

Some also use shallower angles for the...

LockOn,

With the razor flat on the face, the cutting edge is around 90 degrees to the whisker being cut, which is what is 'generally considered' the optimum angle of blade to whisker.

I have...