Your shop is better equipped than many commercial vac repair shops--how many of them have a buffer,Hoover bag cleaner,and a stock of older vacuums!A bag cleaner machine still could be handy today.I have tried using upended uprights as "bag cleaner" but no luck.Best I could do at this point was use a Rug Rat tool on my NSS M1 or NuTone 430 central vacuum.