I had a DX-35 I modified for 6m back in the late 50s. Had to have been an article in QST or 73 or CQ or
. If the article can be found, should be easy to do now days, probably enough info to be able to modify the -60.
I used the DX35 with a pair of 5 element beams and a ground plane for 3 or 4 years.
DX-35 on 6 Meters:
QST, December 1958, page 93, PDF available on the ARRL members web site
CQ, January 1957, page 48