Good point, I know a chap who can do that so I will - once the fork is out - get it round to him. See next post for why that won't be today...Those Allen screws are stainless. I suggest you take it to a machinist and have him use a carbide tip to drill it out. Drilling by hand just won't work and those sliders are expensive. When you install new screws do coat the threads with an anti seize material.