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If using tapered wedges and you want the bolts to not be carring a moment from lack of perpendicularity, you can get what are called spherical washers. They are a 2-piece design that handles the substrate not being perpendicular to the bolt axis. McMaster-Carr has them.
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E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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