This fence is nothing more than a big T-square made from hardwood scrap. It needs no rails because it slides against two panhead machine screws in the cast-iron table. I added locknuts to mine so the fence can be adjusted for blade drift by screwing the bolts in or out. I found the fence so useful that I added a taller fence for resawing. If your band saw table does not have threaded holes as shown, drill and tap them.
– Lonnie Cook