Hey all,
What method do you recommend for painting locomotive wheels safely (as in without damaging any other parts of the locomotive) ?

I ask because, as you can see, Bachmann's James the Red Engine has light gray wheels and axleboxes on the tender where these should all be matte black, and I don't want to mess up my brand-new model. Black Sharpie has been recommended to me in this case, but it doesn't get in all the nooks and crannies and comes off when it's overwritten.
What method do you recommend for painting locomotive wheels safely (as in without damaging any other parts of the locomotive) ?

I ask because, as you can see, Bachmann's James the Red Engine has light gray wheels and axleboxes on the tender where these should all be matte black, and I don't want to mess up my brand-new model. Black Sharpie has been recommended to me in this case, but it doesn't get in all the nooks and crannies and comes off when it's overwritten.