Just use bike chain. Alternatively use painters tape (masking tape) on the bottom of a pedal then sticky velcro. That way the pedal paintwork doesn't get affected at all but still more than enough stick to attach a pedal to a board.
I'm fixing up a bit of a beaten up 1991 Mexican fender jazz bass. It's missing one of the screws that let you adjust the saddle height. Does anyone have a spare or know exactly the screws to buy? A link etc or a screw would be fantastic! Please feel free to message me.