Spool Holder Ender3

This bearing-mounted spindle (replacement for stock, static tube) for a Creality Ender 3 will handle a variety of spool sizes. My main target that other designs miss was older Taulman3D spools that have only a 19mm hole. The large threads match the stock, so the two stock nuts could be used instead of printing the rectangular one in my design. I printed some parts (red in pix) in PETG and others (black in pix) with Taulman's Alloy 910. Hardware is based on 1/4-20 SAE. The bolt is 6 inches, fully threaded. The four tiny lock-washers are necessary to prevent the bolt head and the inner nut from contacting the side walls and creating friction. The bearings I used are 1/4x5/8x7/32, smaller than those in drawings. I used a nylock nut for the outer, and two (thinner than normal) "jamb nuts" instead of the one inner shown. There are some pretty large spools available these days - which may overwhelm this design that is expressly for my stash of old taulman spools. I haven't tried any of the 5-10 lb spools??