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It's a bit hard to get an exact measurement, at the ends where the cast flange is, it's around 235mm (OD) but I'm guessing the tube itself is closer to 230. The Sw600 mirror is different from the dob (SW680). The 680 is an F5.9 F/L 1200mm, 203mm mirror according to the spec, the SW600 F5 1000mm F/L 200mm mirror. The rings at MAS are advertised as 235mm so they should fit. Might be worth giving Steve Massey at MAS a call and asking if there is any variation in the OTA diameters between the various models, his phone number is listed on the site and he usually answers his phone.
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