I am curious as to why having a callous somehow makes you an "experienced" or "pro" musician. In 30 years of playing, never had one. Also, never had fret work done on my basses. Maybe I'm not heavy-handed enough?
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If I have a gig where I really dig in, I'll get blisters under my callouses; Then I lose the callouse and have to start over again. the best thing to do is lightly sand your fingertips. This reduces the heat buid up from friction, thus avoiding the blister. IME.