Common imaging train

Takahashi TOA-130 + TOA-35RD + ASI6200MM Pro + EFW 7×2" + OAG-L

The TOA-130 with the TOA-35RD reducer quotes a metal back distance a little beyond 55 mm. Full-frame mono: ZWO only recommends 2" wheels for the 43 mm diagonal, the camera wears its M54 tilt plate, and the wheel and OAG-L bolt on with screws rather than threads. Every bore in this train has to clear the diagonal. The metal back distance exceeds the ZWO train by a stock ring plus shims; the tool lists the fewest.