Musky a great idea, read it a few times but I may have hit on a solution to the problem :-
Cut the piece you need from the chopping board from the other end from the existing handle, then you can say it can be used left or right handed or both, or, it's R&D invention for ambidextrous users (you can be on easy street)....?
Sorry couldn't help it..duTch
Oh yeah , if there's still slack in the chain at full adjust, best go for a new chain