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The SkyWatcher series of Dob's (at least the one you have pictures of) have a peculiar focusser (and I hope I get this description right)...
Most focussers come with a 2" 'hole' into which is inserted a 2" to 1.25" adaptor. This allows you to put in either 2" or 1.25" eyepieces (you just take the adaptor out for the 2" EPs). However the SkyWatcher uses a 'just a bit bigger than 2"' or 'just a bit smaller than 2"' hole in the focussor (I forget which). This means an adaptor is required. What you see in your photo is the 1.25" brass extension fitted to a 2ish" plate sitting in the focusser. To change to a 2" EP the plate is removed and a 2" adaptor fitted, then your 2" EP into that - wow that was a mouthful.
It's a little bit fiddley, but if you mainly have 1.25" EPs it's no problem. However if you do end up buying the scope make sure it has the 2" adaptor or you'll have to purchase one.
Hope this makes sense
VAZ
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