Yeah I use a grease needle depending on how little the opening is where the spring sits and just pack that area with some plain old grease and it helps keep the spring from ever popping out. Never had one do it in 15 yrs as a professional mechanic.

I believe he has a low pinion axle so it should be ok.
Sure, no, pretty sure, yes. I don't have a ton of up travel & the shaft does not travel too much at that point. As soon as my yard drys out enough to pull this pig out I'll check.