Okay, a buddy dropped by asking me to help him with a vintage schwinn. It has the old Shimano freewheelin' crank; I've never worked on one of these before. Looks like a standard astabula style crank otherwise (I have worked on those plenty). Couldn't find word one in either Barnett's oor Sutherlands. Wanted to make sure before I pulled it off that the freewheel mechanism wouldn't come apart and cause untoward difficulties when I overhaul the bottom bracket. Anyone ever worked on these?