Sometimes I think that to be a true quilter you should also be a mechanic. I love tinkering with things, but have learned it is better not to. My son called it correctly when, at 15 yrs old, he stated, "Mom you are mechanically de-clined!" Still LOL (+25 yrs later)!
I clean and oil all my machines regularly -- tuneups and repair - they go to the shop for professional service!