Convert your single speed GSO Crayford focuser into a dual speed focuser. Kit includes microfocuser unit, 2mm allen key and M4 scew. You will need a Philips (cross-head) screwdriver that is not included.
Note that your single speed focuser must have a tapped set screw on the underside between the two silver Tension and Focus Lock thumbscrews. Some single speed focusers do not have this extra screw hole between the two silver screws, and you will not be able to upgrade those models. Most, but not all, single speed focusers from GSO have this screw. However, please check this on you focuser before you order this kit.
This kit will work with focusers on telescopes made by GSO for Meade Lightbridge, Hardin Optical, DSO, Antares, Zhumell, etc. It will not work with William Optics focusers or any other non-GSO focuser.