so i've used the same chair at my wheel for almost 10 years. it has cracked in 1/2 twice, the rails keep popping out and now it has lost a very important screw. it has earned retirement but finding a suitable replacement is tough. my neighbor gave me a sweet little chair that i thought i could just switch out but oh my god, no. the new one feels like concrete on my butt and it's a different height. the old one has those awesome carve-outs that make it soo comfy..having the proper seat at your wheel definitely affects your throwing.
take care of your chairs, people.