The basic problems with the old PPC Coinola mechanical spool frames was
that it was put together with all-thread, tubing, and nuts.  No spool
frame can keep its alignment and track its rolls when built that way,
and no matter how much work you may do with bushings and initial
alignment, the only thing that will actually keep it aligned,
ultimately, will be the board it is screwed down to.

The next thing that is wrong with it is, the side plates were cast from
aluminum.  Aluminum is too easily compressed by the bolts and things
that clamp to it, and so you will find things getting loose.  Use
lock washers.  Tightening threads with glues won't help with soft
castings, because it prevents you from retightening them.

The final problem with these clunkers is that the plates were not
drilled accurately to begin with, so even after you have aligned
everything like you think they should be, you'll still probably find
yourself using a hammer to do your final "adjustments" with.  They are
real "beauties."

So if you want the beginnings of a usable spool frame out of that
thing, machine the stretcher bars out of 1/2" or 5/8" steel rod, and
put machined threads on the ends.  Then use a flat washer and a lock
washer behind each nut.  At least, that's how you begin.  Then take a
new piece of heavy file folder and when aligned flat to the roll chuck
spindle, it should lay perfectly flat to the take-up spool.  There were
a few good ones made.  Maybe by chance you have one of those.

Craig Brougher