NIGHTMARE! Removable bridges in a word are a nightmare. I've been struggling with two bridges for years. This first bridge I'll share now is against the door casing. The bench work is "L" girder and I made the decision for the bridges to rest on the L leg. The bridge is electrically connected via phone jacks on the left side. The bottom of the bridge rests on the L and slides into the phone jacks on the left side. Track on both ends of the bridge are soldered to the pins. Bench work track is hardwired at each table end where it meets the bridge. Styrene shim stock is used to assist in bridge alignment. This is the easiest bridge to install as it stops next to blocks on each side of the doorway. The fit is tight (notice the scratch marks in the 1/8 plywood edge) and flexes when sliding the bridge into place. This bridge is 3" wide and the track is on homasote. There is not much seasonal expansion or contraction in this area since the bench work is anchored to the wall. However there is a slight twist where an outside bridge rail dips below the outside bench work rail. The bridge fit is tight (30" bridge) and I'm able to align the bridge to the bench work track by hand and it pretty well stays there.
I'll share my comments on my other bridge that is 32" away from the doorway and may provide interesting trackage for you to consider.back of left side with phone jack (mating plugs)
I'll share my comments on my other bridge that is 32" away from the doorway and may provide interesting trackage for you to consider.