Yes did some testing with a 7.5mm shaft. Most likely a better setup today would be 2 x 16mm small ID bands with 8mm shaft. Actually the Sigalsub small ID 14.5mm bands would probably work really well as well as I have incredible performance with just 2 x 14.5mm bands on my Denton 130 using an 8.5mm shaft.
https://www.youtube.com/watch?v=dSxIDUdjv8Q
https://www.youtube.com/watch?v=wQ_FLbLfEb0
And Denton 130 with 8.5mm and 3 x 14.5mm bands. I also tested with 2 x 14.5mm bands and very impressive performance as well.
https://www.youtube.com/watch?v=KYFTrQPOk0Y