Can I just check (as a hirer not an owner) that I am always safe to do as BackPacker describes and lean to roughness then enrich to just smooth? I appreciate this won't result in best power or economy but am I right that this will always avoid the danger of detonation? Some cylinders will be ROP but none will be dangerously lean?
(FWIW this is the exact leaning technique in the T67C POH I've just been mugging up on for a conversion this afternoon.)