I had enough of the filter wheel, so I swapped it for a Gerd Neumann filter drawer and at the same time I installed a Zwo OAG (replacing the ugly 50mm guide-scope).
It wasn't easy to focus the OAG, but I was successful, also the distance between the field flattener (55mm) and the Atik 314 has to be spot on, I was able to do it with some thin plastic ring spacers and some clever calculations...