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Discussion Starter #1 (Edited)
Hi,
I just got a Century C93 today in a trade..

The rear sight turret free wheel spins around. Whee!

Does anyone know the correct size for replacing the ball bearing and spring from a hardware or auto store or should I "bite the bullet" and spend $7 to order the spring and ball bearing from HKParts | Heckler & Koch Parts & Accessories

Also, are there any instructions on doing the job? It looks simple but I know how "looks simple" often isn't.

Any newbie advice for someone who has never had a roller delayed blowback rifle before?
 

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Yes you will need a new spring and ball bearing.

You will also need to acquire a sight tool at sometime. https://www.amazon.com/Sight-Adjustment-Tool-Style-Sights/dp/B013TODYA6

This will save you a few bucks.

https://www.robertrtg.com/store/pc/Sights-c118.htm

http://www.hkpro.com/forum/hk-long-gun-talk/132108-crap-i-lost-my-detent-ball-my-rear-sight-2.html

http://www.hkpro.com/forum/hk-clone-talk/210433-ptr-91-rear-sight-detent-ball.html

OK now that all the work has been done for you.

Now comes the sarcasm. The little white box in the corner is called the search box. :biggrin:

Welcome to the site.
 

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When you pull the rear sight, look inside the recess to see if the ball bearing is present. It is a silver ball so if you see something reflecting it is present and you just need the spring (made that mistake once, assumed since the spring was gone the bearing would be too, wrecked a spring before I realized my mistake. I have found when remounting the rear sight it is best to have the rifle upside down in your gun vise. It makes the job of positioning the sight with bearing and spring in place a whole lot easier. Remember that the windage screw must be in place on the sight base and as you position the rear sight and you need to get the rim of the windage screw into the slot on the rear sight as you get it in place. Then just hold it tight as you tighten the screw down over the oval and lockwashers. If this does not fix the problem (turret should not be wobbly/have play seperate from the rifle) check for excess play then determine if needs tightening or replacing.
 
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