Summary

Hardware list:
To assemble the drum:
(6x) M4 x 25mm stainless steel flat head screws.
They cans be self tapping or you can tap the holes in the drum and use regular screws

To assemble the the drum to the handle:
(1x) M10 x 75mm Stainless steel socket head cap screw (outside).
(1x) M10 Stainless steel Nylon lock nut (handle side)

To assemble the knob to the drum:
(1x) M6 x 25mm stainless steel flat head screw
(1x) M6 Nylon lock nut
(1x) M6 Staniless steel flat washers

Adjust the tension until the adjustment suits your comfort.

Remix of https://www.thingiverse.com/thing:2569032

Thumbwheel from: https://www.thingiverse.com/thing:728871

Threaded ferrule for break: https://www.ebay.co.uk/itm/STAINLESS-STEEL-SLOTTED-SELF-TAPPING-THREADED-INSERTS-NUTS-M2-5-M3-M4-M5-M6-M8/192580337015?var=492703481868