MT-24EX mounting ring repair/cleaning

[jpgruber]

Hello,

Need some help/advice. I've had my MT-24EX since 2015 and have used it extensively in the field. I've noticed the gray spring-loaded release button on the top of the mounting ring getting a bit sticky in the last year or so. This morning it seems to have failed. Yesterday it worked fine. This morning when I attempted to attach the mounting ring to the end of my lens, the gray button did not 'snap' back out and the mounting ring spun easily around the lens. I tried using my rocket blower to clear dust around the button and added a bit of lubricant to no avail.

Canon seems to have discontinued service on the MT-24EX. Looking for some advice on how to get this repaired. I assume the internals of the mounting ring might just need a good cleaning. Has anyone ever opened one of these mounting rings? If so, is it easy to put it back together? Any repairpersons out there for this sort of thing?

Thanks much and Happy New Year!

[jpgruber]

If yours is not broken, I would strongly suggest not disassembling it further than you have. I wonder if the innards can even be reassembled by hand. Wonder if the mounting rings are initially assembled by robot. I'll continue to fiddle with it.

Parts catalog is here if you want to see the pieces - https://f20c.com/stuff/canon/partslist/MACRO%20TWIN%20LITE%20MT-24EX.pdf

I can do without my MT-24EX ring as I also have an MT-26EX.  Just nice to have a spare mounting ring in case something goes wrong with my MT-26EX one.

Thanks for your help.