bontybonty
Dirt Disciple
It's basically down to trial and error with square taper. Use a cheep shimano unit too establish the right length. Them track down a better one ie XT when you have the size.
Last time i ended up making a little wooden model.. took me all of 10mins
View attachment 804279
...pushed it in
View attachment 804280
..pushed the crank on, made sure the rings didn't rub the frame, marked a line, measure the axle.. bobs yer uncle.