I have a Maytech 6374 with a cracked magnet.
The crack itself is not too bad but I have a spare can that I can take new magnets from if I need to replace it.
Pictures of the cracked magnet:
Should I just battle harden the can and hope that the magnet stays in place or should I swap it for a new one?
If swapping it is the way to go what is the best way to remove the magnet from the epoxy?
It’s stuck on there pretty tight.
I’d just epoxy that bad boy in if it’s still tight. I’m sure an expert will tell me that it’s going to disrupt something in the motor but I would ignore them because I am stubborn and lazy 
I can’t image that your wouldn’t damage or shift the other magnets while trying to swap that damaged one. Prob just epoxy it in and cross fingers
If you have some magnets laying. Just replace it. If the magnet shatters in 1000pcs and it hit your windings you need to buy a new motor 
Well I have a spare motor can that also has a properly broken magnet, I was thinking I could use a magnet from that one to replace this one but I have no idea whats the easiest way to get the magnets off the cans.
They are epoxied in from the factory, probably gonna need some solvents or something ti get them loose 
You had a magnet crack on a factory hardened motor? What was the brand of the motor if you dont mind my asking? Did the epoxy in the factory hardened motor do its job at all? I’m just wondering if I should further battle harden motors that are factory hardened.
No I got the motor second hand knowing that it was cracked.
It survived going full speed into concrete so it’s in pretty good shape all things considered.
It’s a maytech MTO6374-HA-C
I have 5 of these and have not had any issues with them.
Most factory hardening I’ve seen has been minimal and deserves an upgrade.
If you run your motors low to the ground I would consider doing it, but in my experience these hold up pretty well.
I’m running mine forward mounted and the truck sits lower than the motor, I think this has helped quite a lot since the truck hits first if there are any rocks or stuff coming your way.
I did just over 1000km on a single drive last summer. (Mostly commuting on paved bike roads)
Upgraded to dual for this season.
No issues with the motor during this time.
I’ve found soaking the can an magnet in a sealed container of acetone works pretty good… try 24 hr first it should work… this is the easiest, but there are other methods…
