[Greg Bock (Greg Bock)]

Up for sale is a helical focuser for attaching to an off-axis guider. Works very smoothly and makes focusing of your guide star a breeze.
$60 posted to anywhere in Aust.

The adjustable focus length is 10mm and achieved in one full turn of the helical focuser. The minimum height as measured from the base is 57mm, and maximum height is 67mm.
The Index is in mm from 0 to 10mm.
Inner diameter is 32mm (1.25"), and a brass ring holds your guide camera.
Fits ZWO OAG's, but i dont believe it is sold by ZWO.

Also has a male 32mm (1.25") thread at the bottom screwed into a 42mm female thread for attaching to the OAG.