I just saw this A2Z Z-Axis extension on ebay for the Taig & Sherline mills and I'm not sure how new of a product it really is. Its a bit pricey, but has anyone here put one on a Taig ?

A2Z Z Column W/Precision Screw-Taig Sherline Mill XTZS - eBay (item 320642743512 end time Feb-12-11 14:58:02 PST)