Good news… two of mine are solid bolts. I’ll have to check with brothers to see what theirs are.I was told only the older Howa mini bolts would take threads. The newer ones have a hollow factory knob (hole in the center of the round knob) not allowing it to have a threaded stud for an aftermarket knob. I got that info from another gunsmith that install knobs on bolts.
Edit: looks like we’ve got 4 candidates including some recent mini’s (6ARCs) all with solid bolt knobs
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