These are the pieces you need to upgrade your K8200 3DRAG with an Z-axis with trapezoidal spindle 10x2mm, with a SKM exagonal stell nut and a Flanged Bearing Housing. The exagonal steel NUT you have to insert into the Z-axis support before the printer will start close the top of the nut. Insert a @pause command on the G code. Then there are 2 kind of top support for the bearing : if you want to use with the flage (as in my case : see pictures) or without the flange. UPDATE June 28th 2014. On suggestion of Roberto Luzzu I added a nut support splitted in 2 parts.