I offer the service of installing tactical bolt knobs on Remington bolts. Here is a few photos I took of how I install a knob.
Prior to turning knob down
Factory knob turned down to 5/16" diameter
Single point threaded
KMW Grenade style knob installed
Bolt in rifle
Here's a Badger Knob that I installed and polished
Here's another Badger knob that was left with the black anodized finish

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Here's a customer designed knob I made