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Have a spreadsheet on the computer. Haven't been keeping part numbers but probably should. The list, so far, is just to scare the **** out of myself as to how much I've spent after the initial purchase. I was hoping I could curb future purchases. Not working so far.
I just keep all my reciepts and I probably have pics of most of the accessories too. I'm afraid to add up the reciepts. I keep all my take offs. If the accessories are worth selling or reusing they will be replaced with stock if I ever decide to sell the bike.