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Hello, that is not at all a common unit, so far it sounds like you have more experience with the problem than myself or almost anyone else. I may or may not be able to help you.
I need to know about how old it is... and if you can attach 4 or 5 photos of the unit taken from a few few feet away so that I can get an idea of the entire lay out, there is a slim chance that I will be able to offer some useful advice.
Use the paper clip icon to attach the photo's, the more I can see the more I will be able to assist.
Out of the million of units on the market Perrymatic has perhaps as much as 0.00001% of the market, not a lot of people will have ever seen one, but many of us will have solved similar problems by the use of generic replacements etc.