@Mark_Rudnik congratulations on the promotion to Executive Director. The London Marble Run sounds like the perfect Father’s Day build to give your mind somewhere steady to land while you take on the new role. Leaving it natural and letting it be therapeutic feels like a good choice.
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@Nita_Davis this is a great practical note for marble-run builders. Sanding and waxing the wood-on-wood contact points can make such a difference in how smoothly the finished mechanism feels.
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Congratulations on your promotion!
Build all the way! Glad to know that this hobby can help you (us) feel better! 
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Finding time to care for yourself is so important. Perfect way to do that!
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