I have a number of typewriters. I wouldn't call myself a "hardcore collector" by any means, but I gradually started picking up typewriters after becoming interested in antique adding machines.
My collection currently consists of a Blickensderfer No. 5, Oliver No. 2 and Oliver No. 9, Remington No. 2 (alas, missing some parts but the price was right) and a Burroughs Electric. In newer machines, I have a Remington Noiseless portable and a Royal Futura 800, though these last two are in another state at the moment... A Silver-Reed Sovereign 750, a Selectric I, and, most recently acquired in my quest for a couple of manual typewriters that I can actually use for some writing, an Olympia SM3 and a Sears Tower Chieftain II, which is really a rebranded SC Skyriter.
I thought I'd join up here because although I have a good grasp of the history of typewriters, my knowledge of how to maintain them and fix them up is far more limited.