arcticcathonda
CGN frequent flyer
- Location
- Southern Alberta
Not sure if this needs to be moved to gun smithing, if it does let me know. I will preface this by saying, this is not the prettiest work, but it worked for me. Perhaps this will inspire others to take a stab at this in their own shop. Total time was about and hour or two. Could easily be cut down if I had an angle grinder for rapid material removal. This is intended for people to learn from my mistakes as I will in the future. This was to instal a 5/16-24 threads EGW oversized knob, so yours may differ.
Step1: Remove the bolt knob/arm from rifle and the bolt body. Try and wrap the bolt arm with something no slip and non marking to put in the vice. ** Tip: I wish I had wrapped all of the way up the arm with electrical tape or something to prevent accidental grinding etc.**
Step2: The most nerve racking part... the first slice! I used a small dremel for this and it was slow going to remove alot of material quickly. **Tip: I would use a angle grinder or equivalent to carefully remove a lot of material**
Step3: Start getting rough dimensions, in this case 5/16"
Step4: Turn the shape into rough round slightly larger then 5/16" **Tip: as you can see should have used tape to protect arm** Tip:next time I would have drilled a 5/16" hole in a piece of sheet metal as a gauge to help out rather than using calipers**
Step5: Put down the power tools and grab a hand file for the finer work to get yourself to 5/16" round.
Step6: Grad you dye set and get the desired threading tool in my case 5/16-24.
After this I did a test fit to see how far down I needed to thread, cleaned up the threads a bit and put some red loctite on to instal knob. Mounted picture with cosmetic damage.
Final instal after painting:
Flame away if need be, but perhaps this helps someone sitting on the fence, I know my next one will go a lot smoother and better quality.
Step1: Remove the bolt knob/arm from rifle and the bolt body. Try and wrap the bolt arm with something no slip and non marking to put in the vice. ** Tip: I wish I had wrapped all of the way up the arm with electrical tape or something to prevent accidental grinding etc.**

Step2: The most nerve racking part... the first slice! I used a small dremel for this and it was slow going to remove alot of material quickly. **Tip: I would use a angle grinder or equivalent to carefully remove a lot of material**

Step3: Start getting rough dimensions, in this case 5/16"


Step4: Turn the shape into rough round slightly larger then 5/16" **Tip: as you can see should have used tape to protect arm** Tip:next time I would have drilled a 5/16" hole in a piece of sheet metal as a gauge to help out rather than using calipers**


Step5: Put down the power tools and grab a hand file for the finer work to get yourself to 5/16" round.
Step6: Grad you dye set and get the desired threading tool in my case 5/16-24.

After this I did a test fit to see how far down I needed to thread, cleaned up the threads a bit and put some red loctite on to instal knob. Mounted picture with cosmetic damage.

Final instal after painting:

Flame away if need be, but perhaps this helps someone sitting on the fence, I know my next one will go a lot smoother and better quality.