Walnut, CA - USA
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Make sure you use some lubricant while you drill the bushing; this will help cool the bushing down and lubricate the drill. You can use wd-40 and just spray a little and drill a little at a time, just keep repeating untill its drilled all the way through. Use 3 different size drill bits though.
Another alternative is to buy the MAH G2 blades with 5mm bushings. I know MAH have them already, I already got a set with 5mm bushings and I like them alot. No more drilling for me.