Maybe in past the slice off was done to shift power unit chain over for wider tire.
Other things like gear box would also need trimming but may of been replaced before you got into it.
On adjustable's I mount the holed adjuster on RH at front and LH at rear for access.
Had to flip mine over once to be able reach adjusters, after fully assembled to find out about that detail. I strap couple of wrenches on and adjuster pick to fiddle them on the road till best comprise on un rear linked and rear linked Commandos.
Its sorta like tuning a guitar, adjust one end and throws tune out the other end.
Part of the fun of such simple ole Commando craft.
