I had to pull out my MM last night and have a look at the DC duct that came with it and I must say it's a joke. [eek]
The blade end of the duct is not attached to anything and is actually pressed outwards (to gain sealing I guess) against the sanding pad installed and depending on the pad you need to add an plastic extension to the duct or not.
Super fiddly with one or two felt O-rings and the loose plastic extension ring...
Nothing is screwed together so everything is just a bunch of loose duct bits in the box. Bet you anything those felt O-rings will go MIA on a worksite at lightning speed. The whole thing is held in place with only a flimsy plastic "clamp" at the electric cord end of the tool that clips over the DC duct to the body of the MM (small slots next to the speed dial).
No, it will not work with blades since the felt O-ring would go flying if in contact against a blade from one edge only and still the duct would be hoovering the wrong end of the blade anyway.
I'm liking my RO90 more and more by the minute! [big grin]