As I noted in an earlier post, Zeus crank arms were milled all the way through up to about 1977 (date code "g" or "h")? Some riders felt the cranks were flexing too much. After this time, the milling did not go all the way through but stopped short. The cranks were made wider and flatter in about 1980 or '81 (date code "j" or "k")??. I am attempting to compile a dating system for Zeus cranks based on the date codes (small case letters) stamped on the inside of the crank arms. I got virtually no response to a recent posting on the topic to the list. Any data would be much appreciated.