JOES Micro Sprint Roller Posts allow your top wing to move back and forth smoothly without binding and will put a lot less load on your wing slider. CNC aluminum top with rollers and stainless post. Save money by just replacing the stainless post (25981) or bearing roller (25980-T-V2) in a wreck.
JOES Roller Wing Post - Wing Post - Top - Straight - 10 in Long - 3/4 in OD - Roller Tip - Stainless - Natural - Micro / Mini - Each