Oh OK I see what they did, just deburring from welding the slots to shorten them. If the round shoulder on the bottom center which contacts the plastic spacer is not ground away (looks untouched in the pic) then add a washer on top to reduce the top end play. If the shoulder was ground off I would additionally add a washer on top of the plastic spacer so the slot piece is just off of the weights to maintain the original dimention. If yours is ground I can get the amount of thickness tomorrow