Modifing a bolt to a different bolt knob.

MilitaryCollectorMark

MilitaryCollectorMark

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Curious whats the way I'd go about modifing the bolt on my zastava. Want to add a bigger knob so I can cycle the bolt better.

Would I sand/grind down the knob on it right now and thread it? Then add a bigger knob loctited?

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Have large hands so having a bit of trouble cycling the rifle. I'd rather cycle the bolt using the palm of my hand in a smooth motion, rather then grabbing the bolt.
 
The knob can be cut down until only a cylinder is left. This cylinder is then threaded for a replacement knob. The alteration can be done with hand tools, assuming a modicum of skill. Replacement knobs are available or can be easily made by anyone with a lathe in whatever style or size is desired. 5/16-24 is a thread size often used. Generally speaking, I would avoid welding. That is just an unnecessary complication.
Keep in mind that you are doing permanent alterations to an important part that cannot be readily replaced if things go wrong.
 
tiriaq said:
The knob can be cut down until only a cylinder is left. This cylinder is then threaded for a replacement knob. The alteration can be done with hand tools, assuming a modicum of skill. Replacement knobs are available or can be easily made by anyone with a lathe in whatever style or size is desired. 5/16-24 is a thread size often used. Generally speaking, I would avoid welding. That is just an unnecessary complication.
Keep in mind that you are doing permanent alterations to an important part that cannot be readily replaced if things go wrong.
Click to expand...

I've also seen lots of M6 used for rimfire knobs.

It's wont be too hard, you could file a somewhat round shape (just measure across the dia to check for roundness and find high spots) and let your die remove whatever it has to. You'll be fine with anything over 50% thread engagement - I am going to be doing this in the new year with my Scorpio.
 
ive done this on 3 Remington bolts. I cut the sides and tops of the bolt off to leave it full length. I obviously cut it to preserve as much thickness as the rest of the bolt handle. Then I ground off the 4 square corners to make 8 sides, then smoothed off the 8 sides to make a circle(rod) then threaded it to the same pitch as the handle going on. Worked perfectly each time. Obviously pay attention to the diameter of your finished shaft pre threading as it needs to be at least the same size as the inner diameter of the handle. Mine were 8mm so I just used a calipers and worked carefully. One was slightly loose. No real problem, I'm just fussy, but I epoxied them on anyway, as I will never need to take them off, and there is no way its ever coming loose at an inopportune time.
 
The operation can be done on a lathe with the bolt body held in a jig, or on a vertical mill, using an appropriate annular cutter. One advantage of these methods is that it is easy to leave a shoulder for the knob to butt up against.
If a bolt handle is removable, the knob can be center drilled for the tail center and the body end supported in a 4 jaw chuck for lathe turning. I've done this with Savage handles.
 
Hey Mark, If you're interested, I do bolt handle threading as well as make custom knobs.






More info/options can be seen on my web site:https://www.prprecisionrifles.com/products-1/p/custom-bolt-knobs

Feel free to PM me or send me an email if you're like to discuss!

Cheers,
Paul.
 
A bolt handle conversion was one of the few times I've been ripped off on CGN.
Laddie wanted a large knob on his 110. I did him a favour - sent him a handle with knob, he was to send me his handle and $20.
Not a word back.
 
Whaddya do when you accidentally buy an early Gen scorpio with a bolt handle that you've never seen before? Looks like something from an Ikea kitchen

 
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