Martin, thanks for the suggestions. I'm glad it takes you a good 5-10 minutes, because it usually takes me a good 10 minutes. Tonight, I will focus on a nearby bright star, and then re-focus some time later once temperature has dropped a few degrees. Hopefully that will improve focus.
Ryan, I was thinking of getting one 3D printed by a friend, but I would rather get the real thing! Feel free to private message me with details (price, pickup suburb,...). Thanks.
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