I meant to reply earlier but got side tracked. I changed the focuser on my C102F to a Moonlight dual speed. It was an easy process, but I did need to touch up collimation afterwards. Collimation is pretty easy to adjust. If I recall, I used a Cheshire eyepiece back then. Later, I bought a Takahashi collimation tool which made it even easier.
Larry - by using the tools you mentioned above, you are describing collimation of the lens. I think the OP was asking if the new focuser needed to be collimated after installation - but I could have misunderstood. Anyway, if you had to adjust collimation of your lens after you switched focusers its likely the lens needed adjustment prior to the switch. Collimating a lens and collimating a focuser are separate operations only tangentially related.
Collimating a focuser is even easier then collimating a lens. The Moonlite focusers have adjustments and the proper method is to place a laser in the focuser and see where it exits the objective lens. You want it to exit precisely in the center. If it does not, you adjust the focuser until it does. This focuser collimation does not affect the collimation of the objective lens - they are wholly independent of each other.
Edited by peleuba, 09 August 2021 - 12:59 PM.