Welcome K: Your router must be an old timer or something special made. I've never heard of a threaded router bit good luck in finding others. Please post more info in your profile when you get the time it will help the RF to give you more help, if we know where you are, different parts of the world have different products available to them. regards
My motto about: WINDSONG GARDENS GOAT RANCH: If God will let me live long enough, work hard enough, and throw enough money into this place, someday someone might have a halfway decent place to live. Amen!