this is for all you broke people with a broken crank arm hole who ride $40 bikes from the salvation army.
you can use j-b weld epoxy (hardware store, auto store) to fix it for $5. i have ridden 100+ miles on mine over big hills and i am 220lbs.
maybe i will have trouble replacing the BB, but i dont care.
i had tried other 'cheap methods' .. drilling a hole in the axle was too difficult (hardened steel), shims didnt work, i had no welder and only one car battery for 'battery welding', locktite '1 minute' epoxy is too soft, and jb 'stick weld' is not strong enough.
i slathered the normal ordinary jb weld over the axle taper and inside the crank hole, then put the crank on, then put the nut on the axle thread, then kinda tightened it (thread was stripped , and broken), and then slathered jbweld all over that. i waited about a day and a half and rode off into the sunset.
keyword: pedal arm, crank arm, jb weld, j-b weld, epoxy, welding, stripped