Make sure you're grinding on your front crank arm.

Best How to Crankarm

Try and start parallel to the rail and hop and turn the bike in the air that should keep you from sliding onto your bb, if I rode with you I could explain it better but if you have a scooter to try on a flat rail it's almost the same thing like getting your weight right. I ride right foot forward but crank slide on my left crank so I do them switch footed

Any tips for doing crank arms on ledges?

i'm learning

i cant get the place beside my crank and pedal, i almost had it but i keep smacking my bottom bracket and kissing the tip of the rail, what are some ways to prevent this?

also i ride left foot forward

The Asian that chose his bike over straight A's

.i can only do crooked's to sketchy ass bottom bracket\crank arm

yea, dont