I am sharing a tool I use to hold a roller above a metal workbench to allow me to easily apply teflon tape while keeping the take from touching the table. The roller pin cutout is .5in x .5in or 12.5mm x 12.5mm so this may work on many other brand rollers besides Lewco rollers. On the bottom there is a slot for a magnet to keep the roller where you want it making things easier.

I used magenets found here https://www.amazon.com/gp/product/B09WHFCHSW/ref=ewc_pr_img_1?smid=A1DUNNNLJTI79T&psc=1 the measurements for these are 10mm/1.26in by 6mm/.24in and the one I choose has a countersunc 5mm/.2 screw hole in the bottom.

To hold the magnet to the block i used a No. 6 ¾ wood screw. There are other ways but its what we have sitting in the shop and it works great.