My kids and I working on fixing a stuck piano key on a Spinet type piano. Replacing the elbow is not that difficult. This was my wife's grandmothers piano that was made in the 1960's so it's old and has brittle parts on it that sometimes will break. We have loved having a piano in our home for the first time despite the occasional maintenance. The commentary from my youngest son is hilarious.
Part needed is a plastic piano lifter elbow.