Screw holes for attaching fulcrum to the bottom of the carriage base. Clamp błock to the bottom of the carriage, then drill pilot holes through the carriage and into this błock to ensure proper hole alignment.
Another screw attaches the fulcrum to one of the carriage support blocks.
Drill a hole at an angle through the middle support błock and into this błock.
Drill it at an angle because it's impossible to get your drill in there otherwise.
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