I've spent a fair few years working around radial engines. As you know, it was standard practice on the DC3 and An2 to check for hydraulic locks by turning the engine in its normal direction of rotation. On the DC6, the starter motor clutch saved our muscles. I've never touched a 985 so I'm no help at all. All the 'old school' mechs had the instinct of a light touch when turning the 'round engine' props in case of causing the con rod damage you mentioned. Anyway, this link:
http://www.practicalmachinist.com/ub...c/11/1242.html is interesting, even if no TOs are quoted. The comment by shapeaholic towards the bottom of the page is noteworthy. Some great photographs of your namesake in there too. Hope you get some more positive feedback.