Oh No

[Dave scutt]

Can any one help please.

I was just collimating my scope and the thread on the bolt has gone .

Can i get a replacement and what can I use in the mean time.

Dave

 

 

[dark knight]

What telescope  is it Dave, maybe get some Bob's Knobs from FLO

[PeterCPC]

Try this:

 

[Dave scutt]

1 minute ago, dark knight said:

What telescope  is it Dave, maybe get some Bob's Knobs from FLO

It's a 12" Skywatcher dob

[dark knight]

https://www.firstlightoptics.com/bobs-knobs-collimation/bobs-knobs-stellalyra-celestron-sky-watcher-newtonian-collimation-knobs.html

[dark knight]

Hmm are they the screws that hold the spider vane in place?

[Dave scutt]

Just now, dark knight said:

Hmm are they the screws that hold the spider vane in place?

Collimation bolt for the primary mirror 

[Laurieast]

If the same as my Explorer 150p, It's the same thread and nearly the same length as the screw on my SV Bony guide scope/finder rings.

It's also the same thread as the screws/bolts you get on the end of some sky-watcher dovetail bars.

Edited September 24, 2022 by Laurieast

[Dave scutt]

Just checked flo , and i think i have the original factory bolts 

[dark knight]

Oh ok well bobs knobs or similar would do,  are you sure the hole they go into isn't also damaged?

[dark knight]

Hmm point 1 in notes makes no sense, maybe message flo to check, I fitted bobs knobs to my 8inch skywatcher newt with no issues and also to a 12inch

[Dave scutt]

[wulfrun]

5 minutes ago, Dave scutt said:

That one is a locking screw, not strictly needed - especially if you leave the other 2 slightly slack. Can't be quite sure in your original photo if the bolt has stripped the thread it goes into, in which case a replacement won't help.

[Captain Scarlet]

Dave Hi that is a collimation-locking bolt. I also have a Skywatcher 12" cell, and I never use those locking bolts, actually: my springs are strong enough to hold everything in place as I move my scope around. Also, I am about to receive an Orion Optics 300mm mirror cell, so my SW cell will very soon be redundant anyway.

Consequently, for either of those reasons, I'd be very happy to send you my locking knobs. Otherwise It would ve going to metal recycyling soon anyway. I believe I still have your address in my PM inbox from the RDF you took off me.

Shall I post it? No charge obviously.

Cheers, Magnus

[Dave scutt]

7 minutes ago, Captain Scarlet said:

Dave Hi that is a collimation-locking bolt. I also have a Skywatcher 12" cell, and I never use those locking bolts, actually: my springs are strong enough to hold everything in place as I move my scope around. Also, I am about to receive an Orion Optics 300mm mirror cell, so my SW cell will very soon be redundant anyway.

Consequently, for either of those reasons, I'd be very happy to send you my locking knobs. Otherwise It would ve going to metal recycyling soon anyway. I believe I still have your address in my PM inbox from the RDF you took off me.

Shall I post it? No charge obviously.

Cheers, Magnus

Pm'd

[Dave scutt]

I feel i bit silly now .

The thread on the bolt has not gone it must be the thread inside , is there any way to fix this.

Dave.

 

 

[Carbon Brush]

Just scrolled all through the thread to tell you the original pic looks like the thread in the scope has gone.
You beat me to it😄

I think I am right in saying these solution arre worth considering...

Option 1. The locking screw does not have to be eactly located.
Dismantle the scope....
Drill and tap a hole nearby.
Exactly where depends on how the mirror cell looks.

Option 2. Drill out the hole to clear out the remant of thread, open up to a size to tap.
Buy some thread reducers like these from Amazon. B09P4K9PMV
These are shown for the idea. You can buy them in various sizes.

I don't have this scope for reference so there may be a better solution.

HTH, David.