Finder Scope O-rings

[david o]

Hi all,

I have a Celestron 6 x 30 finder scope, the kind that has a quick release dovetail bracket - a bit like this one. There are two adjustment screws and a spring loaded bolt holding the finder in place at one end of the sleeve, whilst there is a rubber o-ring holding it at the other.

The rubber o-ring on mine has broken. Does anyone know of a source of replacements for these? Or even if they are some standard bit that I could find in any ironmongers?

Thanks & clear skies.

[dark knight]

Hi David try here

Polymax Ltd

[Mr Noble]

Has anyone got any more tips for finding one of these elusive o rings. I need one for the finderscope on my 9x50 celestron finderscope.

Polymax site is down at the mo.

I'm amazed that none of the scope shops seem to carry these perishable parts in stock or even know where to get them from!!

Cheers

Greg

[Starflyer]

The site's working for me at the moment and I'm glad I saw this thread.

I have a 50mm right angle TS finder that I'd almost written off as the rubber has completely perished - now I can get around to fixing it

[keithatrochdale]

The rubber o-ring on mine has broken.

Have you tried sticking it back together with CA glue?

[steppenwolf]

I managed to get a replacement by blagging one from a dealer who owed me something but for at least a year, I just used an elastic band - this worked a treat!

[Mr Noble]

It was a firefox issue for me, it worked in safari ok.

I wonder if anyone can measure their o ring so I can order one the correct size please.

Internal and external dimensions and the thickness would be great.

Thanks

GN

[johnmc]

From another forum someone sugested that this would be 31.47x1.78mm, 1-1/4"x1/16", therefore BS026, http://www.bearingstation.co.uk/Products/O_Rings/Nitrile_O_Ring_-_Imperial/1.0_-_1.99_Inch/BS026 or http://www.amazon.co.uk/BS026-Imperial-Nitrile-O-rings-Pack/dp/B0032TRIJ2.

My finder scope OD is 32mm and the ID of the holder is 34.7mm.

I will give this a try.

[Moonshane]

I have used elastic bands too. otherwise try a local hardware shop. they often have a stock of odds and sods.

[AndyH]

A couple of sources for 50mm finder o-rings. For a smaller finder, some guesstimation of sizing would be needed? .......

On fleabay. 46mm I/D x 1.5mm diam -

http://www.ebay.co.uk/itm/METRIC-NITRILE-RUBBER-O-RINGS-1-5MM-CROSS-SECTION-37MM-ID-TO-49MM-ID-/370953310645?pt=LH_DefaultDomain_3&var=&hash=item565e8a51b5

Agena Astro(US) -

http://agenaastro.com/agena-rubber-o-ring-for-50mm-finders.html

Andy.

[Davey-T]

I have used elastic bands too. otherwise try a local hardware shop. they often have a stock of odds and sods.

Do we still have local hardware stores, certainly none around here, don't know about Catalunya

 I've got a box of three hundred assorted O rings from my plumbing days anyone wants to post a size I'll see if I have a match.

Dave

[Moonshane]

we have quite a few locally - we must be lucky.