I had the same experience. The likely reason is the tubes are stuck is because there is a build up of rust and grit between both tubes. You are on the right track; it's a slow process. Try using a better quality penetrating oil applied from the bot...
Everyone who responded scores 10/10. I had a similar problem and jumped to buy a new motor. That was a mistake. The best operational fix is to be patient, run the front at little-run the back a little and tweak when necessary. Unfortunately the j...
Thanks for sharing your Happijack experiences. My jacks have given me grief for a few years; really noisy, non-sychronized lifting and getting stuck. Tried to get professional service this year and all the shops are booked until the end of August. ...