Fuqido Gaming Chair Armrest locking nub

Not sure what the part is actually called but it is one of the locking nubs for moving the armrest forward/backwards. The screw that hold the whole assembly onto the arm of the chair came loose and when I removed the top cover the spring and nubs flew off.  Found 1 of the nubs and the spring but was still missing one.  So measure, print, and back in business.