Sounds like the Stock Bearing. Stock bearings ate 5mm wide concave D bearings.
If you want more response. Add more thick lube or grease.
The 4mm wide that is linked gears it more towards 0A.
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Not trying to beat a dead horse, but with the 1mm decrease, there really isn’t any issue using the stock axle?
I just don’t want to find surprise nipples 
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Thanks for the clarification 
I think the 4mm flat is what I want. Gonna order some and give it go. Thanks for the clarification. 0A play is more what I’m looking to get out of it. I have plenty of slim C throws to satisfy my responsive 1A itch. Even with a slightly narrower bearing I think the Workhorse still has enough rim weight for some decent spin time.
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Again! Again! Encore! Encore!
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There’s cheaper ones from the same brand, but these are ABEC-5 and run a bit smoother:
https://a.co/d/5nI7Zod
You can also search “R188-2RS Bearings” for other options of double rubber shielded flat C (or “R188-ZZ” for metal shielded).
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As mentioned, they come pre-lubed, but I’ve found the amount and quality of lube varies quite a bit. Some seen fine for quite a while, others I need to pop a shield off and add a drop of 3in1 oil. You can also reuse the shields which is nice, they press fit back in easily if you don’t chew it up too badly removing it.
These are the same bearings I’ve been using in several sizes for my printed yoyos, and overall I’ve been really happy with them.
For the A size bearings I’ve been adding a glob of thick wheel bearing grease to get them really snappy, but those are also being given out as gifts to people, many of whom have never yo’d before.
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For grease and lube I really like traxxas grease and or for an oil super lube synthetic. It’s essentially brain lube
Danco silicone grease works well too
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No issue.
Part of the design.
3mm wide will not work without modification. But 3mm wide makes the gap to narrow.
3mm D bearing blanks work from ZGRT because they are slightly larger at the rim and dont actually go into the bearing seat. Giving you a true fixie with a 3mm gap.
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How does it play as a fixie? Ive been thinking about picking up the zgrt blank for mine
A second for fast eddies. I use him for almost all bearings now. MR85, A, D, and weird bearings I’m experimenting with.
You can get most with rubber shields which I like. You can buy in bulk. I’ve purchased soooo many bearings from him.
He doesn’t have c bearings right now but you can find those on Amazon under R188 bearing. That’s their part number.
Quick edit on lube. I used to use super lube but am now a Nano Oil convert. I like the 85 weight for thick lube. 5 weight for thin.
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I thought the blank wouldn’t work - this is great news!
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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