I have just started replacing brushes on my K machine's dearation pumps. I have been soldering the new brush's wire to the contact post. After looking at the contact post I'm wondering what could happen, if instead of soldering you just put the brush's wire through the hole on the post, then just push the electrical connector down hard on the post thus trapping the wire. It seems pretty firm and hard to displace and certainly a lot easier. Any thoughts?

Congratulations, you have discovered how just about everyone does it. It's quicker and, I believe, better to do it this way.

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That's how I do it too. Be sure not to feed to much of the brush wire in through that hole before you put the sleeve back on the post. That will cause the brushes to loose contact before they're actually worn down due to the wire holding them back. Seen a couple people do that and have had the pleasure of replacing their brushes well before 8000hours.

I used to solder it too until someone showed me the easier way. Soldering is probably better, but considering the part, it's not critical to have it soldered. I've been doing it the easy way for years and it's never failed me. If it was a component on a board, I'd solder it. Motor brushes? Not any more.