The 130sf would be better for binoviewing, binoviewers usually need about 10cm of focus travel, even if you use an extension tube for ep now, you might need to trim 5cm off the tube
I'd change the focuser if it were me, keep an eye on the classifieds here.. If you are going to use the plastic one have it as high on the tube you can position yourself to, having it horizontal will strain it more
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