Gaming Chair Replacement Part

Hey, I recently ordered a replacement part for my chair (in background), and I'm trying to remove the part from the cylinder. However, no amount of force I exert seems to do anything to it, it just won't budge. I don't particularly care about damage to the part I'm replacing, but obviously do care about the rest of the chair. I don't have much in the way of tools at home, and I'm not really in the budget right now to buy anything else. Any advice?

Hey, I recently ordered a replacement part for my chair (in background), and I'm trying to remove the part from the cylinder. However, no amount of force I exert seems to do anything to it, it just won't budge. I don't particularly care about damage to the part I'm replacing, but obviously do care about the rest of the chair. I don't have much in the way of tools at home, and I'm not really in the budget right now to buy anything else. Any advice?