Here's a cheap fast fix for this annoying problem of not being able to use the winged cups that come with these zooms. First gather together the 2" adapter barrel, the small 43mm eyecup and the winged eyecup. Next you'll need either super glue or clear silicon, your choice.
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Permanently mounted is an Istar 10" F/11 R30 with a Jaeger's 6" F/8 and a Shrine Manon 2.4" F/11.7 both piggybacked on board. Also an Edmunds 76x760(1958), Criterion Brownscope 25x45x75x(1957), Tower 7x35's and Tower 10x50's(1956). Plus an Aries Chromacor N hidden inside the Istar!!