Bolt spacer for z-axis brace

This is a small update to hge excellent thing by TyphonPS - I use it on my Maker Select Wanhao clone

Wanhao Duplicator I3 Z brace with adjustable feet (Hardware store special)
www.thingiverse.com/thing:1359774

I don't like the feet though, so i decided to use some 3/6 15 Levelers. Problem there is the thread is 3mm or so narrower that the holes in the print. I may redo those holes if i reprint but for now i made some nut and thread 'boots'. The boots reduce the nut and thread size allowin