How can I unjam Loppers?

I have an old Lopper that has a bolt for the screw. When I was cutting some branches, it started getting a little tight to cut, so I used WD-40 and that is what caused my loppers to jam. Are there any solutions I can use to unjam the Loppers? Please advise. Thank you.
Dee, August 2023


done
Slacken the bolt. Consider adding a locking nut. Maybe a nyloc one.

Dbdjdj, August 2023