Greetings GMC Instructors.
The callus covering the tip of my left middle finger has gotten so thick and hard that I'm losing control over whole tone bends. I notice if I grab the string above the callus and allow the string to "dig in" to some fresh skin I create a new groove in my finger and thus regain control. Problem is, after a bit of playing (especially when bending the G String) the string starts slipping out again and tries to find its way back down to its natural position in the hardened, grooveless callus.
Do any of you guys experience this? Is there a trick that I don't know about?
Maybe a surgical slit with a razor knife?