Air-Way 66
Ian,
I can add a little to what has been said on this thread. If you can check the March 2004 issue of the VCCC Newsletter our past leader R. J Vanik did a whole article about just this subject.
What he used was a polishng bonnet for a disc type automotive polisher. They are a terry cloth fabric with elastic sewn around it's border. You can buy them in different sizes in the auto parts store. I replaced the sound suppessor on my 66 with one and it has worked fine for years.
In the "old" days ( 50's and 60's) our Air-Way man came around at least once every year to sell new bags,filters,check the hose suction and of course TRY and get you to buy a new machine. In those days it was recommended that they change the sound suppressor and check over the motor every 5 years.
Also back then the carpets and carpet pads were not so thick so it was not a big a problem.
It is my understanding the "sound suppressor" was to catch the carbon dust as the Air-Way sani-bag filtered very well for it's day.
I do remember my dad taking mom's 66 apart,washing the suppessor and reusing it again. That Air-Way is still running today.