I use long needle nose to get the old one out, Harbor Freight-about $4, comes in handy for a lot of other things too. I use this stepped rod with a washer to get them in. It’s actually an old throttle shaft. Grease the grommet as mentioned to make them slide in easier. Once you start to see part of the tab from the outside of the housing you can get the tip of a small screwdriver on it to help coax it into place.
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