A couple of weeks ago I happily removed all of the Nylatch fasteners from the modules of my 80B console and replaced them with Well Nuts purchased from Grainger, P/N 3ZLV8. Well Nuts, I learned, are basically rubber rivets that have many uses such as holding fiberglass body parts on snowmobile frames. This particular Well Nut has a brass 6/32 threaded nut molded into the bottom of the part. They come in packs of 25 ($17.00 USD) so $68 does the job with plenty of spares left over.
To install each well nut I recommend: Use a cue tip to apply a little silicone to the holes at each end of the module and twist a well nut into each hole. It's a bit of a bitch after a while but a nice firm fit in the module hole. It's also a really nice fit into the console with no mod to the frame required. After installing a couple of modules I began to get the feel of how to drop them into the frame with ease. Total time was about 4 hours.
To complete the mod: Install black 6/32" screws, 1/2" in length, and black nylon washers 4mm id, 9mm od, 1mm thick. I bought the screws and washers for $14 from ebay. No need to over torque the screws... a modest amount of torque compresses and expands the rubber beneath the frame hole enough to hold the modules firmly.
After a couple of weeks of use the well nuts/modules are holding nicely, Aux On/Off switching is solid, and no electrical connection issues. The console feels put together and solid like it should. Today I removed an input module for maintenance and there were no issues.
Finally, I'd like to acknowledge how important this forum has been to me during the past 18 months as I restore an 80B. It feels good to put something back and perhaps help someone else this time. Thanks ARCF! Charlie