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Colin,
Thank you!
On the attached images you can find more design details - 3D printer was very useful here. (Probably the best and most versatile DIY project I embarked recently).
Prism (obtained from BXoptic) is blue, SA is purple.
White components were 3D-printed.
The whole plastic assembly (grism holder) rotates inside the holder (M42 extender), the movement is limited by the slit cut into the wall of the extender.
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