[raymo]

O.K. Loosen off the 2 knurled knobs at positions 2 o'clock and 6 o'clock in
pic 1. Remove the eyepiece holder/adaptor assembly so you are left with the open end of the focuser as in pic 2. Separate the 2 parts of the assembly you removed from the focuser.[ pic 3, ] so you end up with
pic 4. Attach the disc with the male thread to your T-ring as shown in
pic 5. Attach the T-ring/ adaptor assembly to your camera. Attach the camera to the focuser as shown in pic 6. Rotate the camera to desired position, and nip up the 2 knurled knobs that you earlier loosened off.
Sounds a bit of a pain, but after you have done it once or twice you can do it in about 30 seconds, or even less.
Pic 6 shows the focuser in approx. the position that it is in when at prime focus. If you want to know what a T-adaptor looks like you will find a pic of one on Andrews website.
raymo