getting the crank nut undone can be a bitch bros
I got this idea from shovelhead.us
as I didn't have a compressor to run my impact driver
the jam bar is made of metal (or aluminium if you run a belt and are paranoid)
about 8-1/2" long (7-5/8" for 5 speeds) by 1-1/2" wide and a 1/4" thick
Chamfer the ends to fit and jam in 4 and 10 o'clock position (opposite to tighten)
As you can see I used a bit of wood and it worked!
Oh and heat the nut, if locktite has been used or its tight.