One of the definitive players of the ukelin (as well as the Marxophone and a number of other obscure instruments) is Katherine Rhoda whom I guess now lives in Hiram, Maine. Haven't seen her since one of the Portland (Maine) shanty sings at Captain Bunker's some years ago, but I just found her website at --

Katherine Rhoda

I have a Marxophone, but it needs to be restrung.

Linn