Nazir 42: If a Nazir Is Bald, Can He Shave?

Tongue in cheek: what really counts as shaving? How much hair can be left, with what tool, etc. Plus, 3 mishnayot: intent for hair removal is salient, dirt would cause hair to fall out, likewise shampooing. And lastly, a nazir who violates his restrictions is only given multiple sets of lashes if he makes it clear that he hasn't forgotten the prohibition, and is going to violate it anyway.