I share your frustration. I did have a little bit of success with my LP90 3/8 inch. See this post.Had the exact same experience with SK LP90's. New guts (took FOREVER to receive) and same problem. Finally just gave up. Total garbage and huge embarrassment for US manufacturing.
Also maddening because ratcheting mechanisms are not new tech. We know how to build them. It's akin to building an oval wheel.....I mean making dem suckers round is hard, pa!!
SK is dead to me. Too many fantastic options on the market, including Taiwanese. Can't waste my time with their crap any longer.
Post in thread 'Recently made SK tools - Quality?'
https://bobistheoilguy.com/forums/threads/recently-made-sk-tools-quality.373554/post-6632636
Maybe try what I did?