Hoard of elderly HPs

[Roger Plant]

Using silicone tubing seems to me not a good way to get a suitable wheel.
I know that wheel and its drive motor get up to some speed and because of that the wheel needs to be dimensionally correct and perfectly balanced.
Does anyone have access to any original HP engineering drawings for the tape drive wheel?
I have the engineering facilities to make new rubber/metal composite wheels and that would be much easier done if I had the HP dimensions to work from.
The drive was possibly not made by HP but original drawings would be good.