Interesting observation about ‘excess’ bonding tabs. I tend to start from a point where nothing on any historical structure is accidental or seemingly thoughtless. In a timber aircraft EVERYTHING metal must be connected to the bonding system, so excess tabs might have been provided to allow additional equipment, installed later or in service, to be easily bonded in. There were so many changes to navigation, radio, radar, armament setups in service that it would help to have a few spare tabs in the vicinity to bond to. I have an extra dooby-wacky washer to post for the bracket mounting that is flat on one side, concave on the other for fitting the bracket to the tube, so no need to whittle one out of old, crusty chewing gum.