Why is there a washer welded to one end of that hexnut axle ?
Glad you noticed: * If there wasn’t a captive washer, tightening the bolts could shift the positition of the hexnut. In the worst case (impossible with the washer) you’d lose track of the axle’s true position and have a false notion of how many turns were applied to the bolts. * You can quickly adjust or remove the weights on the ‘washer side’ and the remaining weights in the central and opposite stack are still completely fixed. * By allowing one or two bolts Kettlestack adjustable kettlebell handles provide a wide range of stack widths. You get the shape and weight you want. * Safety and very quick weight adjustments.
