There are two things you should consider when buying a second hand stairlift.
1/ See it working, how can you be sure it’s fully functional if it’s in pieces in someone’s shed?
2/ How old is it? True, most don’t get much use, but isn’t it best to buy a newish well known model?
If it hasn’t got remote control, it’s probably too old!
Here is my modern remote control stairlift, not had much use,
Rise 13/14 stairs and seat pivots,
Complete with two remotes.
Can assist with removal.
Pleas come and try before you buy??