mccullough promac

Hey fellow Mac enthusiasts! Was wondering if there is anywhere to buy/ idea to make a block off plate for the exhaust and carb to get a vacuum pressure tests similar to my Stihl tools that block off the intake and exhaust. I have read a few things in the Mac threads about people making them...

Worked great until something broke. Not sure. Was running mix. But seems to have no compression now. Keeping bar. Oiler works good. Needs a rebuild most likely. 75 plus shipping. Clean up and put in mantle or fix and use.