[blueridgerunner]

Rebuilt my clutch MC yesterday. The small return passage in the bottom was clogged with a sort of corrosion, not rust, and I had a hard time clearing it. I finally put a drop of CLR on it and let it soak for an hour. I was then able to take a thin stiff wire (welding torch tip cleaner) and clear it out.

 

[gaswing]

Well done. I've seen some corroded up so bad they couldn't be saved.

 

[JerryH]

Wish mine had been that easy. My sight glass turned to dust and fell out, shortly after I rebuilt it. It's actually plastic not glass and the AZ sun had completely disintegrated it. I had to take it all apart again, clean the casting really good, and filled in the hole with JB Weld. I ground it down nice and smooth, and so far, after a year and a half, it is still holding. Actually glad it was only the sight glass, the older models had plastic reservoirs (like on the rear) and the whole thing would disintegrate.

 

[Shadowjack]

An American dime is perfectly the right size to use as a filler plug in the sight-glass hole. A little epoxy like JB Weld to seal it and you're done.