I got a MIJ Tele with some real nice relic knobs, I really like them but could not find a similar replacement to fit 6.35mm (imperial) solid shafts. I prefer these to some that are going for $50 on ebay so surely there must be a DIY way? I managed to enlarge the control plate with just a metal round file but the knobs are proving much trickier. I used the file and even resorted to a hand drill, holding knob with a capo but it doesn't seem to be getting much larger. I can see bits of brass coming off from the inside but it still doesn't fit the shaft. Should I use a drill but that fits in the hole and use that to widen the sides of the hole or should I go for a bigger drill bit and try to drill that in to fit? Any other tips?