I'm glad you had a pleasant experience with the Aerus associates. Many are, indeed, nice but mercenary nonetheless. Have you thought about painting your white cleat with paint formulated for plastic?
Aerus would do well to return to a universal, standard pricing system. In addition, the company would benefit as a whole if it developed a shared database of NLA stock to which each franchise would contribute and have access, to better accommodate customers who desire them.
One of the Aerus franchisees I dealt with did go the extra mile for me, when I was looking for such a part. He bought it from another franchisee and sold it to me with the shipping charge. So two franchisees and the customer were all winners, and an item that was just sitting on a shelf collecting dust is now being put to use. Also, I've given the franchisee business since.
On the other hand, another local Aerus franchisee, who's a fast, smooth talker as well as being patronizing and obnoxious is one that I wouldn't patronize even if he had a NLA for which I was looking. It's just not worth the extra time listening to his spiel and having to endure his jabs; besides, I'm sure he'd price gouge. One time I was there he went out and yelled at a neighboring business's customer who'd parked in a stall in front of his store.
While that last one is an extreme, my overall experience with Aerus has not been positive; sorry to say.
I'm sure your local franchise's model collection was quite amazing. The franchises I've been in only have a few vintage cleaners displayed such as the Model XXX, a Model G, a Model 1205 and a Model Super J 1401. None have any vintage accessories or shampooer/polishers.
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Btw, is your RS an 8.1A or 8.5A? I just noticed a Special Edition 1572E (with ponytail) on eBay with the 8.5A. It seems the upgrade occurred around 1990 with the HP tank motors.