Yup- big mystery on that R frame- but Elsie parts are not that hard to find- I have bushings for the pre-1913 series guns, machine screws and through bolts, top lever springs-etc. The real main difference between a std. weight Elsie frame and the shorter FW frame- besides the dim. at the front "knuckle" is the length of the cocking rods- I'll send you a personal e-mail and we'll see if I may have the original (not Galazan or Numrich after market) parts you need-

"The field is the touchstone of the man"..