I have a Bally 1090-10 and on my hopper the dollar is sitting on the "Rail" and has a small NUB that helps keep the Dollar in position. As the dollar reaches the roller, it lifts the roller and the coin rolls out. The chute does not come apart the way yours does.
Not sure what has to be done to fix that. Maybe a small c clamp to bring the chute back together. Probably can't be left there during play with the door closed...
Maybe some other Bally EM people have an idea...
Good Luck
Bill in Spokane...
Not sure why my Picture is posted at 90*'s CCW...