The only FS-60 model which accommodates the 2" ( Part 69 - TKA21110) adaptor is the CSV version and even then you can only use a 1.25" diagonal and EP's (see :
http://www.astronomy-electronics-cen...ystemChart.pdf) Being of such short focal length you need a fair bit of in focus which the CSV version offers. The C and CSB models do not show the 2" adaptors on their system charts for this very reason.