Replacement O-Ring bumpers on SW Dob

[Nab (Darren)]

Hi all,

The o-rings on my dob perished and fell off - exact size (measured) replacements have been sourced, but do you fit them at A (in the groove) or B (above the flange) - see photo.

They had fallen off so I could not check the original position - nothing in the manual either. In the groove (A) seems to do nothing, above (B) is preventing the spring clips from engaging.

Maybe its just a matter of them needing to flex a bit with use?

I'd welcome some wisdom.

Thanks.
Darren.

[billdan (Bill)]

Hi Darren,

Just had a look at my DOB and the O-ring definitely sits in the groove, and yes it seems to do nothing.

I thinks its only there to protect the OTA from getting scratched by that extension tube.

Regards

Bill

[Nab (Darren)]

Haha! Well there you go.
So much for me thinking they were for some kind of vibration cushioning!

Thanks Bill.

Darren.