I bought this spindle at onlyforever702 (ebay url bestchoose702). It worked but didn’t last very long. I bought it April 9, 2015 and it failed yesterday March 11, 2016. It took a month to get it (no issue there it’s from China) and a month to get it mounted on my 6040CNC so it really only got about seven months of light use out of it.

As you can see in the picture below the shaft snapped right above the front bearing.

Similar spindles:

http://www.ebay.com/sch/i.html?_odkw=er11+brushles&_sop=12&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR4.TRC2.A0.H0.Xbrushless+spindle.TRS0&_nkw=brushless+spindle&_sacat=0