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dew heaters
But I envy you the ability to make one yourself. If you have that inclination, you'll find there are hundreds, perhaps thousands, of small projects that can incrementally improve your scope function. Fans and dew heaters for the secondary and finder scopes, modifying the scope in other matters (Dobs are tremendously amenable to customization and modification, being mostly wood or particle board) to improve its motion properties, etc. Check out the Projects and Articles section for some examples.
Cheers
Scott
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