Change Note 10/27/19 - Now assembles in-place for positive retention.
Assembles with three 1-1/2" minimum length 10-32 or M5 bolts and two hex nuts. Tilt the little leg to hook it onto the underside of the handle, then plop it down onto the printer. It can migrate front-to-back on the printer, but can't slide off side-to-side. Could benefit from the addition bit of a little magnetic tape.
Unsurprisingly compatible with a 145mm build area.