Mag drives are pretty solid except for the shaft. I've broken 2 before. Be sure to do a good vinegar bath for a day before trying to take it apart so it comes apart alot easier when cleaning it.
Try and keep a spare that way you can pop one off, pop the other in and clean the used one when you get time.
You can find them for less that $50 alot of times in the for sale forum. I've collected 3 of them in good shape with a few spare shaft too.