Join Date: Dec 2018
Location: Northern Virginia
Nope. The notch is not a factory accessory. I will not affect the function of the plane. If it bothers you, look for a replacement cap. Grinding or filing away enough material to eliminate the notch may affect the performance of the plane.
Many lever caps are chipped near the center from their use as a screwdriver to loosen the screw holding the chip breaker to the cutting iron. This is quite handy, but a risky practice I do not recommend.
"Whether you think you can, or you can't, you're right." -Henry Ford