"I tried this when this guy on YouTube made it all the r
hehe, I have "this guy on youtube's" Tristar (minus the original motors, 120v motors don't take too kindly to being fed 240v!!), and the reason why the VGII mod doesn't work is that people who tried it used the 2-strip VGII brushroll with standard bristles, as used in Eureka power nozzles, where infact you want to use the 4-strip brushroll and use VGIII strips, these protrude through the rugplate and do a fine job of cleaning... 
Piccies of course:
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