Been using the search feature to no avail, but I could swear I once saw a thread on this...

Quite some time ago I picked up a Nishijin hanemono circa 1990 on CL for free along with a vintage parts machine. Apparently the guy who had these sold off parts of them and the girl who posted them on CL just wanted them gone. I recently got around to finally cleaning it up and taking a look at it. It actually works quite well and each pocket pays out...

...BUT, there's no ball hopper on the back! Obviously I've no extra hopper laying about. Has anyone had any experience in making a ball hopper for a modern? Any type of fix is appreciated - the fact I've a hanemono machine I cannae play is driving me nuts!!