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o-ring for SkyWatcher 50x8 finder scope

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I have just brought a used Skywatcher 250 dob but the 50x8 Finder scope is without the o-ring so it flops about and is useless.  Does anyone know what diameter the o-ring cross section is or where I can buy one from.

I have ordered a Rigel QuickFinder but it would be nice to have the finder scope working as well.

Thanks, Pete.

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If bought new the supplier would sort you - they sometimes hide in the box somewhere. An elastic band works well or take a trip to your nearest hardware shop i bet they would have one

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