Agree with schuylergrace and Frank S, all kinds of positives.
T-handles a possibility, potentially get caught up in sleeves and cuffs. Having them part of kit, saved for useful manipulation might solve that.
Like Marv observes, the balls may lap in after awhile and slip; the centered bolt is large enough to delay it for some time.
Only detail I'd really alter is contour of the bracket clamping the spheres. Arch or peak in the middle, truss-like; averting bend or collapse with tightened fastener, backed up with heavy washers.