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The back of the Yoke disintegrating is a common problem on sets of that era.
You could just glue the yoke to the bell of the tube with some low acid Silicone, the problem with that is of course you would have to get it perfectly level since you couldn't easily move it later, also the centering rings are usually located on the back of the yoke too so if the mount had rotted they're hanging loose also.
People have made new Yoke covers, takes a little time and ingenuity.
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