Use the Takahashi Adapter Blocks with the 16" Versatile Dovetail Plate (SBD16) to attach the Takahashi Mewlon, BRC and FRC. The blocks are designed to accommodate ring sets having fastener spacing at 18.0 cm (optical axis) by 4.8 cm to 15.2 cm in width; utilizing the M10 fasteners typically provided by Takahashi.
Two Takahashi Adapter Blocks
Fasteners listed on Mounting Plate Fastener Chart
Please review the Hole Pattern Chart.