Celestron Feathertouch SCT Microfocuser - Manual (Page 4)

Step 6
Thread on SCT MicroFocuser
Begin threading the SCT MicroFocuser onto the threaded focus rod.
When there is only about 1/4" left to go, simply push the focuser the rest of the way in.
This will take up some of the change in focus from when you removed the original
focuser, making it quicker to return to focus the first time you use your telescope after the
SCT MicroFocuser installation.
Step 7
Attach the SCT Micro Focuser
Use the three original Phillips screws to attach the SCT MicroFocuser to the telescope.
You are now ready to head out under the stars!