A long time racer suggested I buy nuts and bolts from an industrial supplier. Much cheaper. Buy spares. He says if he needs to buy one piece of hardware he always buys a full box.I have a box of about every nut and bolt i hope i would need including a spare metric nut for the mychron. and a bunch of the safety pin style cotter pins. a roll of electrical tape. snap ring pliers, diagonal cutters. and a bottle of ibuprofen because i'm old and sore.