what are chromatins, is it a mis-spell of chromatics? (sorry if i sound sarcastic, i actually am not sure if chromatins is actually another thing)
are you saying that when you play guitar, your thumb tends to peep over the top of the neck and 6th string...
i cant think of any proper immediate remedy other than 2 sellotape itthere or something while you just practice playing with your hand in one fixed fret position, e.g. 5th position... also start playing with your thumb lower down the neck vertically
Murder For a Jar of Red Rum!
failure 2 prepare, is preparing 2 fail, :(
if you keep doing things the way they've always been done, then you'll keep getting the things you've always got