Reader Theo, from the bike nirvana that is Amsterdam, sent his own take on a DIY wheel jig. For some other ideas on DIY ways to keep riding in a straight line check our our previous 7 DIY Bike Wheel Truing Stands post. Ride linear!
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I made a copy of the original old fashion Dutch 'Koets' wheel jigs from iron shelf support rods (scrap metal) I welded together (as you can see I am not a good welder...). For the truing I use old iron saw blades.