reply to u/MirageAnne at https://reddit.com/r/typewriters/comments/1mgmwkq/remington_rand_17/
There are two general types of "sticky keys": 1. sticky going up 2. sticky coming down
Sticky going up
For stickiness slowing down the typebar (on the way up or down), it's likely that you've got oil, dirt, dust, or other sludge in the segment of your machine. You'll want to flush out your segment with some solvent and potentially blow things out with compressed air to remove the source of the friction.
While you're flushing out the segment with your solvent of choice (lacquer thinner, paint thinner, mineral spirits, alcohol, etc.), actually move the typebars using the keys or by other means. This will help to get them moving and allow the solvent and subsequently compressed air to help flush the oil, dust, hair, etc. out of your machine. You've already got a mechanical cleaning device of sorts (the typebar itself) inside the segment, so move it while you're flushing it out!
It may take a few repeated treatments/attempts to get it all clear for all the keys, but it's far easier than taking everything apart.
When you're done, it's common wisdom that one should NOT oil the segment.
Sticky going down
If your typebar(s) are sticking due to friction at the typing point, then they need some gentle forming to the right or the left to prevent them from rubbing on the typing point so that they can fall back down to the type rest. The two videos below will help describe and demonstrate the symptoms as well as the repair. - https://www.youtube.com/watch?v=qrlt6VyC8D0&t=485s - https://www.youtube.com/watch?v=Arspyq1w4Iw
Other considerations
It's much less common, but once everything is clean and properly aligned, if you're still seeing sluggishness, it may be the case that the spring on the individual key has broken or become disconnected which prevents it from returning back to the type rest.