You also need to hang up your Dremel. I don't remember if the instructions say something about this (and I'm too lazy to check), but the flex shaft doesn't really work well unless you have the tool suspended somewhere above working level. The shaft doesn't have to be perfectly straight, but you can't have the Dremel lying on the table and use the flex shaft. There's a holder you can buy that's basically a pole with a hook on the top that clamps onto your table. Shouldn't be much of a trick to rig up something by yourself, either.
Check the box for the driver cap. I know I had some funky little extra piece for my flex shaft, so yours is probably in there somewhere.
My flex shaft doesn't take any particular time to get moving from the time that I turn it on. I don't notice it getting hot, but it's possible that it does warm up and I just don't think about it.
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