The SteinAir shipment arrived (half of it anyway) with the isolating washers so I installed the pilot and co-pilot headphone jacks couldn't get them very tight using just finger (tough to access) so I'll look at getting a wrench in there. I was able to find an extra set of step isolating washers and isolating washer in my electrical "junk box" from the RV-7A project. Then I attached the wing connectors to the left and right side although there is no guidance on orientation. I need to replace the corresponding wing root connectors (the male tabs broke off when fitting the wings) so I'll just make sure they correspond pin number to pin numbers. (Update: Bought new wing connectors)