Thick adapter plate for filter slide

[fwm891]

I'm in the process of buying (bought) a Celestron RASA 8. Initially I was going to just use it straight with my ASI294MC Pro and an UV/IR cut filter. Then a Baader filter slider came up in classifieds but that meant I could no longer use standard extension tubes to get the required 25 mm back focus from the RASA's connecting adapter to the sensor.

I used the slider's existing adapter plate (48mm) as a template and made one to the same outline but with a 42mm T2 female thread. 

Photo shows the new adapter plate before painting and the original it replaces on the left.

Waiting for the scope to arrive now.