HoTech has two videos on Youtube that detail its use. Watch them multiple times and watch them closely.
For GEM mounts, use the mount's polar alignment adjustments. If you place the OTA horizontally, you need to use just the Az polar adjustment and the DEC axis can be used for up/down. However, I found that collimating a 14-inch scope horizontally resulted in it being miscollimated when pointed up. So, I collimated it pointed up at 45° and the results were better. But when you point it up, you have to use both polar Az and Alt adjustments to 'co-align' it with the HoTech CTC but the movements will be non-orthogonal, i.e., adjusting each axis results in the cross moving both up/down and left/right, a bit like SCT collimation screws. But it's easy to learn how to make it go where you want.
Hope this helps,
I had already watched the videos but will do so multiple times more. Also, David from Hotech sent me this response today:
"Swing the scope to one side of the mount so the bar is in horizontal position (scope on one side and counter weight on other side). This way, the scope adjust only up/down for co-alignment. Then you need to move the collimator left/right in position to cover this missing scope left/right aiming adjustment. We suggest mounting an additional linear rail slide between the fine adjustment stage and the collimator to achieve this adjustment without lifting and moving the collimator side way for small adjustments."
Frankly, after reading all of these posts, I am questioning my wisdom on getting this device just to save the hassle of waiting for a night with excellent seeing to collimate with a star using the AstroGold mask which is much better than the standard donut method. However, I will give it a try and see how it goes.
On another note: I was looking for M3 x 12mm stainless steel hex screw caps to replace the 3 phillip screws but no luck unless a buy a pack of 50 and have to wait a week to get them. So, just going to try with the current screws like I have in the past.
Edited by Umasscrew39, 27 November 2018 - 04:43 PM.