EF-M to EF adapter on EOS M6 ii loose. 70-200 can fall off. What can I do?

Before the R mount came out, new adapters could be had for 50-100 on Ebay.

Supplies have gone done so prices have increased.

Used on Ebay
Canon Mount Adapter EF-EOS M to EF EF-S Lens
88 USD + tax + shipping

Refurb on Canon
https://shop.usa.canon.com/shop/en/catalog/mount-adapter-ef-eos-m-refurbished
128 USD + tax + shipping

I have my adapter from the original M and it has held up well, i don't mount heavy lenses on it though.

Helgaiden wrote:

Your experience with Viltrox parts you actually have firsthand experience with is quite the opposite of mine. The Viltrox EF to M43 speedbooster I use on my panasonic is rock solid, and other people, who actually owned the Viltrox EF-to-EFM adapter, here (as well as reddit where I posted this question as well) have thrown their support behind the Viltrox adapter.

That's entirely possible.  It may be that only certain products they produce have issues.  Surely Viltrox wouldn't still be around if their products were problematic and there's a LOT of people who use their adapters.  When Canon ran out of RF adapters, everyone had to look for an alternative.  I noticed that the Vitrox EF-EOS-RF adapters (for the Full Frame EOS R cameras) have also been generating issues for owners with loose fittings causing issues with Contacts and some users claiming their batteries are being drained, even with the camera turned off (whist a Viltrox adapter was attached to their EOS R cameras).

I've found at least a contributing cause to the issue I had with my Fotodiox though. The screws in the back of the mount (like the bottom picture in the quoted post) were loose. I tightened them back down and its good again. I may redo the tightening of those screws by adding blue loctite to keep them from backing back out, we'll see.

With all that being said, a previous poster suggested looking at mpb.com and ordering an official canon adapter from there, which I did. I'll keep the Fotodiox for a second lens or as a backup. Am really going to have to try figure out how to get the foot back on the lens for larger lenses though. I couldn't use it with the adapter because it interefered with the smallrig cage I have on the m6 ii.

I noticed that I rarely use the "foot" accessory that came with the EF-M Adapter from Canon these days unless using that mini-tripod accessory that folds flat.  I'll use that item with any of the heavier or longer lenses.  Otherwise, I usually just remove the "foot" and simply use the adapter by itself.  It may seen "too tight" when you first attempt to mount it to a lens but it's simply very snug.  You probably won't notice any play at all in comparison to your older adapter from Viltrox. But there's a very, VERY small amount of extremely subtle movement that is barely detectable.

Really wish Canon still sold the M series cameras with the adapter in there like you showed at the top of your post! That would be great. Considering the overall lack of support the EOS-M mount has gotten, it would have been smart to at least start doing that again once the M50 hit and the M series got popular again.

I think so too.  It's a very handy accessory by itself and there's been no need for Canon to update it at all since the release date. It has a slightly (very fine) "mottled" texture to reduce the visibility of finger prints.  The outer shell is a type of sturdy impact-resistant polymer that looks and feels like metal... with a metal core, metal mounts and a metal foot.  The contacts are literally gold-coated to prevent oxidization.  This design is very robust and the decision to use a polycarbonate shell was a good idea to reduce scratching and to eliminate risks from salt air exposure.  The adapter fits so snugly you might be forgiven for thinking it's waterproof (it won't be).
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Please chime in to let us know what your thoughts are when yours arrives, now that you will be able to compare the two adapters side-by-side.  I'd be interested to see your observations.