Ars-Imago Lab-Box クランクハンドル - オレンジ

The crank handle fits snugly and makes advancing the film onto the spiral feel much smoother than the stock knob. Agitation is also easier on the wrists after a long day of developing.

My wrists used to cramp after a few rolls, but this crank handle makes rotating the spiral feel almost effortless. The orange color is a nice bonus, too—easy to spot on my counter.

The crank handle is a big improvement over the original knob, making film loading much smoother. It does add a bit of bulk to the tank, but the extra grip is well worth it for agitation.