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Hi Dan
Which low profile focuser were you looking at? Mounting limitations vary.
You'd normally upgrade to a 200mm ota from 130, so I'd suggest calculating based on that.
With the 130mm, you could move the mirror up a bit with longer bolts and springs rather than fit a large focuser, else you'd have to make an adaptor plate or fill the gap but key is to make sure the focuser is perpendicular.
You can do that by using a simple collimated laser with the existing focuser, make a small mark on the inside of the ota of where the beam lands, then change the focuser and adaptor and make sure the beam hits the same spot.
You'd need to temporarily remove the spider and secy.
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