OzFclass

Tony, yep thats it, a single use.

Theres a link to the recording of the borescope below.

Having checked, the springs feels waaaay too hard to compress with my thumb.

Heres the kit, the arbor and the spring.


Heres the vid. You can see where the springs gone in and then come out. Sorry about the quality, trying to hold the camera and scope together, focus the pic and follow the rifling while staying steady is hard.

Just for the record, it looks like my scope lens is cracked, but its just a piece of plastic thread or something thats floating around in the eye piece. It moves around. Its not worth pulling the thing apart to remove.

http://youtu.be/6tOpmcSOzMU

Mighty fine bit of video work, Denis. Until you have tried to do it, it's difficult to explain how damn hard it is to do a 4 handed job with just two hands !
Its quite amazing damage.
Weirdly, the worst of it, where the top of the land is damaged the worst, is not "unlike" my buggered Bartlein.......Except mine is 100% of the length of every land, with none on my Grooves.
But that short shocking section of yours is virtually identical ?

Tony - doesn't have to be the hardest metal on the planet - just harder than your barrel. You can now see why we originally thought your damage looked like a "barb" or other on your cleaning rod ferrule or other. Your cleaning rod would ride over the groove and only gouge the tops and sides of the lands in this case. Denis' spring would push down into bottom of grooves scratching all the way but a small lump or barb on a cleaning rod would not. A cleaning rod barb would present in the symmetrical way yours has..... back and forth.

English Match Rifle shooters use collimators regularly, for example to check sight adjustments each range in team matches, but they have the spuds turned & gently sanded to a suitable fine taper using brass rod.

I have a similar device,the first time I used it,it seemed to be too loose in the barrel and flopped around,I got worried about damage to the barrel and removed the spring.A wrap of paper around the rod centered it in the bore,however the whole business was too much for me and I gave up on using collimators.
Mike.

Denis, I have a BSA branded bore sighter that looks identical to yours except for one little thing.

The spring on mine looks to be made from a soft material where as yours looks stainless steel?

RJNEILSEN wrote:Denis, I have a BSA branded bore sighter that looks identical to yours except for one little thing.

The spring on mine looks to be made from a soft material where as yours looks stainless steel?

DOH!! Trust me to have the unusual. I think the collimator at the local SSAA also has a copper or brass springs, also probably not as large or pronounced.
I wonder how many people have unknowingly screwed their barrels using this Nikko Stirling rubbish.

Here is pin loose. Looks like stiff copper wire.

Cheers,
Ryan.

Denis,

Where did get the collimator? If it came via an Australian dealer as a genuine Nikko Stirling product, then you might have a valid claim for damages against the manufacturer.

Alan

AlanF wrote:Denis,

Where did get the collimator? If it came via an Australian dealer as a genuine Nikko Stirling product, then you might have a valid claim for damages against the manufacturer.

Alan

Alan, it was purchased a few years ago at a local dealer. I've decided I'll contact Nikko Stirling about it and see what they have to say. It doesn't seem right does it, for this to happen when the tool is used for it's intended purpose.

DenisA wrote:...It doesn't seem right does it, for this to happen when the tool is used for it's intended purpose...

I'd put it more strongly than that. It appears that it would immediately damage any barrel it was used in. It wouldn't surprise me if the other calibre arbors in the set caused similar damage.

Great care needs to he exercised for these things. I have a Bushnell collimator that uses expanding arbors that are a lot safer than the NS ones.

It is a slow deliberate exercise using these things even so...

Longranger wrote:Double post.

Shoulda left it for tragics like me that read everything.

I use that tool on a daily basis and have not seen any damage from them.
As others have pointed out the Tasco brand one I use has a copper/brass looking spring vs the one that appears to be chrome plated like yours?

I am surprised that such damage has been done with a round edge of the wire.

I trust the damage was at the 12 oclock position?

JH

John23 wrote:

I trust the damage was at the 12 oclock position?

JH

Sure is John. There's no doubt of the cause. In the video you can see where the springs tracked inwards, settled at the end, and then tracked a different course out wards.
Once I found the end of the gouge with the scope, I put some tape on the tube, pulled it out, sat it next to the barrel and marked the position on the barrel. I setup the collimator and put it next to the barrel. The springs is in perfect alignment with the end of the gouge....... No doubt about it.