Lab-Box slinger

This crank makes the agitation process feel much smoother than using the knob, and the ergonomic handle reduces hand strain during longer developing sessions. It fits perfectly onto the Lab-Box and has held up well through several uses.

I was skeptical about the crank vs. the standard knob, but the longer handle gives me a much steadier grip during agitation. It's a simple upgrade that makes processing feel noticeably smoother and more controlled. Glad I gave it a try.

The crank’s longer handle makes agitation so much smoother than the tiny knob—my wrist doesn’t cramp during the full five minutes anymore. Fits right onto the tank and feels solid in hand, definitely worth the extra money if you process a lot of rolls.