I have a pneumatic gun. It makes greasing easier by simple trigger operation. For the kingpins I was advised to lever up the bronze plate and watch for grease emerging out of the gap. I used bearing grease. Hard chrome kingpins greased regularly at 1000 miles max intervals. No problems after doing 50k miles. Car sold with 74k on the clock and no play. I considered the remote greasing but didn’t change to it. When greasing underneath it is an opportunity to check other things at the same time.