I use the Sullivan tail wheels on all my tail draggers including my GP Struka 60. They are inexpensive and a good design. On some planes that havea narrow fuselage at the tail I mount the tail wheel bracket on to a small piece of aircraft ply the same shape as the bracket with the 4-40 blind nuts in the ply. Then glue the aircraft ply to the underside of the fuselage. Makes installing very easy. [8D]