Your theory is spot on unk...the first model cowlings had no strap or feet, not sure of intro model but im sure it was later even than series 2 but more likely late in the series 2 run. Also used on hg palmers of the same era. Also the first cowl of this type was released on the 2a with no previsions for a starter or tank. The toe ring was intoduced on the model 2 rotomo and continued on to the 2a,3 and utilities with the steel bases well into the 60s . I think some of the HG nobles got the toeguard as an option along with the height adjust.which would be around the middle of the rotomo 2 run.
