@herorareheart those are a PITA since there will be a time that the piston actually pushed through the base and will drag on the floor. Simple design since the piston really just sits in there and should only move in to the first increase in the diameter. Should be, but since it is all plastic it’ll eventually wear out. Now, you can purchase a new base that will fit your piston (measure the diameter with a pair of calipers for a proper fit ) Places [https://officereplacementparts.com/Office-Chair-Replacement-Parts/Chair-Bases/|like this] have them but not really that cheap. I would go all ifixit on it and make a collar with an inside diameter of the 2nd diameter of the base and an OD about 1/4” to 1/2” larger than the diameter off the hole in the base. Use some set screws to keep it snug on the bottom so that it can’t slide through.
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@herorareheart those are a PITA since there will be a time that the piston actually pushed through the base and will drag on the floor. Simple design since the piston really just sits in there and should only move in to the first increase in the diameter. Should be, but since it is all plastic it’ll eventually wear out. Now, you can purchase a new base that will fit your piston (measure the diameter with a pair of calipers for a proper fit ) Places [link|https://officereplacementparts.com/Office-Chair-Replacement-Parts/Chair-Bases/|like this] have them but not really that cheap. I would go all ifixit on it and make a shaft collar with an inside diameter of the 2nd diameter of the piston and an OD about 1/4” to 1/2” larger than the diameter off the hole in the base. Use some set screws to keep it snug on the bottom so that it can’t slide through.
@herorareheart those are a PITA since there will be a time that the piston actually pushed through the base and will drag on the floor. Simple design since the piston really just sits in there and should only move in to the first increase in the diameter. Should be, but since it is all plastic it’ll eventually wear out. Now, you can purchase a new base that will fit your piston (measure the diameter with a pair of calipers for a proper fit ) Places [https://officereplacementparts.com/Office-Chair-Replacement-Parts/Chair-Bases/|like this] have them but not really that cheap. I would go all ifixit on it and make a collar with an inside diameter of the 2nd diameter of the base and an OD about 1/4” to 1/2” larger than the diameter off the hole in the base. Use some set screws to keep it snug on the bottom so that it can’t slide through.