Hi folks.. I am not sure there is right length between the excenter rod and expansion link to the Stuart compound twin steam engine. The measure is 2 1/4" in the drawning of expansion link if use reversibel Stuart compound twin steam engine. Also the excenter rod has 2" length between centers and the expansion link from fastening hole for excenter rod to the bow hole is 1/4 = Total length is 2 1/4". Is it fault measure at 1/4" in the drawning of expansion link? Would it be 1/8" from fastening hole to bow hole in center of measure? See at the drawing of expansion link: R 2 1/4" and R 2" My Stuart compound steam engine who are not reversible has excenter rod with the total length between centers 2 1/8" as this drawing..