I found that if I didn’t shave about 2 threads off the axle I got surprise nipples on both of my protos.
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NOTHING worse than surprise nipples!
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In watching Jake’s videos of preparing these Workhorses for distribution, he was adding oil to the bearings to get them responsive. This method will always require periodic maintenance and when preparing so much at once it’s no stretch to imagine at least a few squeaking by with a tad less lube. Grease can get the same and even greater response as oil and is much more maintenance free. This has been my experience. I have yet to relube a bearing that I’ve greased. 
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How do you shave down the axle? I have a disc grinder and a 12 inch disc sander but that seems overkill for such small axles.
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Dremel.
Another warning of sorts… if you put a 4mm bearing on an unmodified bearing post** it will be very difficult to remove the bearing. These things have tight tolerances on the posts and with the 4mm bearing the bearing puller will hit the top of the post before going deep enough into the bearing to get any leverage/bite on it. Then the pliers may need to come out and this is when you start getting into dangerous territory. But if you want ridiculous response… it’s hard to beat a lubed 4mm.
** On my proto I shaved the posts a bit to determine if the posts were colliding before the halves could fully close down on the bearing.
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I plan to leave that 4mm in until the end of time.
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My puller wouldn’t fit the concave bearing in mine, but maybe my puller only fits type C bearings. I used pliers and slowly wiggled it out. 4mm bearings should be delivered tomorrow. Once this is installed and packed with grease I don’t plan on removing it 
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My zgrt multi use bearing tool will not remove them at all and fits a little looser in bearings I’ve noticed. The tool that came with my el mijo fits perfectly and can remove any and all d bearings. I kinda wish it was sold separately so I could have a backup.
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I really need to get a bearing removal tool for the smaller and oddball bearing sizes. The ZGRT one is sold out everywhere, and you’re not the first one to mention issues with it. Maybe I should get the machine shop down the street to make something for me.
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5 mm diameter will fit A, MR85, and D bearings. Some folks use a 5 mm drill bit end.
In theory these metal pins will fit C bearings on one end and A, D, and MR85 on the other. Gonna order a box and report back.
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For real. I have this guy
and it’s a loose fit. Typically you can get deep enough to get some leverage but if there were a puller that fit a bit tighter that would be great for a situation like this. And just in general you could get a lot more bite as your El Mijo tool demonstrates.
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If you can get them to do it and they make a great one maybe you could place a small order with them to sell. 
The ZGRT has been out of stock for a while and there just is nothing else available you can buy. So I imagine if the price was right there could be a few on here that might be interested. I know for a fact I would. Especially if it were multi functional like the ZGRT but just a puller. Maybe even a tad longer than what has been typical.
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I’ll be interested to see how this turns out because if it’s great then no one will ever need another tool ever again. 
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I’m also invested in how this turns out, haha.
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Samesies. We are all waiting with baited breath.
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Good luck finding them in stock tho
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@Slestak75 @AudreySickburn @MinerJ we have a couple of Throw Keys available. As we are brining more MiJos we will be making more bearing removal bodies and lids. We fixed that gap issue for slim bearings.
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Y’all! High recommend you buy one of these while they’re available. Been looking for one and I just lucked into a BST surprise and it’s ballin’! I’d get another if I wasn’t afraid of stealing one from someone else
Edit: To clarify, I meant Throw Keys. I don’t personally have a dog in the MiJo race. But I’ve heard those are pretty dope too.
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