some of the iron guides you can buy have the spiral cut in to the guides for added oil if you go this way. i would have to think about it if i had not one tool and was not around any shops then the way dennys said is the way i would go if guides are not to beat out .this would be the cheaper way to go with out so many tools .when i do guides most all the time i go to mang bronze i feel this is better then iron so i go this way .but i do have knurling tools i just try not to sell a job with a knurl job if every thing is new .but i would on a re ring job