I think in Simon’s case, as he is laying out rafters its a calculation that only needs to be considered based on centerline- except for the end piece. I think in the case of the balusters you’d just have to know how far apart two need to be to get you the 4" gap and then use that distance in the subsequent array calculation. I still think in terms of an existing solution, profile builder is the most helpful, and as it’s parametric it allows for changes on the fly even after clicking away from it ( unlike the native move tool which won’t).
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