Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5276361.
I ordered a rubber-handled thumb wheel ratchet of Amazon (third party seller, I think) and received the metal-handle ratchet. Since I wanted to use this on my printer nozzle, I wanted a little heat-insulation, so I quickly designed this handle.
This is a very tight fit - I had to use a C-clamp to press the two together. If that doesn't work or it's too loose, scale the x & y directions a bit. This was designed around Performance Tool Part W36125, but could probably be scaled to fit your model. The Performance Tool ratchet has an outer-diameter of 38 millimeters, and so this handle has an inner diameter exactly that, hoping the knurled handle will bite into the PETG
I suggest printing in PETG as PLA is more brittle and will need a little more clearance.