Hi Myles:
Thanks for the link.
The pullover for RS-1500 seems very comfortable.
However, there seems to be an error in Darklab hubs not being compatible with the Studer A807 and A810:
"The darklab hubs are compatible with most reel-to-reel decks with the possible exception of Studer A807 or A810 machines equipped with the standard trident reel take-up. It turns out that the darklab (or any other brand) fit as well, but for some Studer devices, these adapters are part of the recorders' motor/spindle plate, thus requiring a special adapter. These two systems are, unfortunately, incompatible."
I think it should be Studer A820 with NAB hub with center button adapter that is not compatible but even the A820 adpaters with three-pronged flanges for "Cine" reel work well with the Darklab.