Where to get a 'handle' for a bolt?

[stickshift]

Thanks for all the suggestions. I ended up buying this lever for $5. It's nice and beefy and lets me apply a lot of torque. Very cost effective solution for my issue.

 

[6PTsocket]

This looks like it would be perfect: Morton Die Cast Zinc Handle Adjustable Clamping Lever with Stud, Metric Size, 20mm Stud Length, M10 x 1.5 Thread Size, 54mm Height
https://www.amazon.com/gp/product/B00GKZADOM/?tag=atomicindus08-20

What is the 'adjustable' aspect of these levers?

You press the button and the handle disengages from the screw. You can move it to a different position. It is somewhat similar to a ratchet handle.

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