Well, after 5 inches of snow earlier this week and predictions of sleet and freezing rain for tonight, I decided that this afternoon was the perfect time to put the hardtop on the Miata for the winter. My son and a friend of his helped bring the top up out of the basement and around to the garage. We installed the replacement Frankenstein bolt for the right side (with two working together, bolting it on with the de-welded and now-loose weld-nut proved to be no problem) and installed the top. Plugged in the rear window defroster, and took it out for a test drive. Snug as a bug in a rug!
The extra rear quarter visibility is immediately noticeable, as is the additional headroom (I'm only 5' 8" but little of that is in legs (29- inch inseam) and even thought the car does not feel at all cramped with the softtop up, the hardtop makes it roomier and nicer). And QUIETER! I had to turn down the radio from its previous setting, and even had to turn off the ALC to keep it from getting too loud as I increased speed.
No chance to see if the rear window defogger is working, but I guess I'll find out in the morning. But the car is snug in the garage; no freezing rain or sleet will envelop it tonight.