Thread: DIY Extended Bolt Knobs

Hi Folks,

I have done this to a bunch of rifles now and really like the results so I thought I would share it.
Its a pretty simple method of adding an extended bolt knob using JB SteelStik. Its the perfect product for this and the whole job only takes around an hour.
You do not need to get the handle threaded or machined at all, simple hand tools are all you need.



Im starting with a factory Howa Mini bolt. I will be using this rifle for service rifle matches, so a fast bolt is important.




I scar up the bolt handle pretty good with a carbide burr on a dremel. You could use files and sandpaper, but whatever you do, make sure there is some mechanical lock for the putty. Im not sure this stuff bonds well to the steel, so a mechanical bond helps. I tape up the bolt body and cocking mechanism so that I dont have to disassemble and clean everything afterwards.




Cut off a section of the putty (note, I did not do enough here and had to add a little more. Probably another 10mm would have been plenty.)
You have to kneed the crap out of it. I have noticed that sometimes there are little hard bits in the mix, if you feel these, just pick them out.
You only have about 5min before it starts to go hard, so kneed it out really good, then slap in on the bolt.

I have discovered that a big round knob works best for me, so I get it on there roughly round and keep working it as it get harder. You can use a popsicle stick or similar to mold the putty where it joins the bolt handle to get a nice clean edge.
I just keep going over it until I cant move it anymore. This does not take long, so you dont want to piss around trying to get the shape perfect. It is very easy to shape and remove material or even add more if you screw up.

Once it has gone hard enough that I cant move it by hand, I give it around 15min to cure a bit more, then get stuck into it with files and sandpaper. You can do whatever shapes you want, and if you decide you dont like it, grind it off and go again, or just add more putty on top of what is there.

I finish it with 320g paper and find that this gives a decent grip and looks ok as well.





I put a bit of a flat on the underside of this one to see if it helps to stop my finger sliding around as I lift the bolt. Probably a more aggressive concave going further out would work better, but ill shoot it a bit first and see what I think.




The little lighter flecks you can see are the hard bits I didnt pick out. You dont always get this but its not uncommon.

I have seen some people do very complicated versions with ribs and knurling but I like a simple ball.

Iv been playing with the idea of spraying one with plastidip rubber coat (basically a spray on rubber coating) But my results with using that on other things has been very mixed, so I might try to get some other rubber coating products to try.

Thanks for reading.