This is a replacement or the TechZone Huxley's tip clamp, to use a J-Head hotend with your TechZone Huxley.
Based on DeuxVis' remake of the tip clamp that was shared on http://forums.reprap.org/read.php?214,102464,155495#msg-155495 and measurements from the J-Head nozzle technical drawing on http://reprap.org/mediawiki/images/2/26/Jhn_nozzle_holder_v5.jpg.
As I understand the comments in the original scad by DeuxVis, he's happy for this to be used for anything as long as his comments remain there.
Fixed distance between holes, and thickened the bridge by the mount for increased rigidity. I've also tested a printed part, and it very snugly. The inner diameter of the groove mount ridge might need to be increased ever so slightly, to avoid bending the part backwards. A bit of sand paper will probably do the trick if it's too tight.
Print, and mount on your X-carriage with your J-Head extruder. It's not ideal for printing that the rounded groove is facing downwards when printing, but it should hopefully work ok. The hole needs no precision, only space for a couple of screw heads.
See also the instructions for how to use the Sprinter firmware on the TechZone monotronics here: