I have got a Seitz tool. Thinking of boaching up some barrel arbor holes in the mainplate . And replacing the with new bushings. What material should i use. Is the ready made bushings i can buy already. Or do i have to lathe them myself.  On the seiko 6139 the is a small bushing in some material. On the mainspring barrel bridge Think  it's  brass. Would like to be able to get a a little less wobble in the mainspring barrel.