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BYD - great advice thanks.
To expand - he means "chase" the threads in blind holes. But you don't have a thread chaser? But you can make one if you sacrifice one of the old bolts or use a lower grade bolt with the same thread pitch/diam. Make 2 or 3 spiral cuts along the length of the thread of the chaser-bolt. Dip it in solvent and ease it down the threads.Remove frequently to add more solvent to the chaser. Dry with compressed air or a heat gun.
You can buy great 10.9 bolt assortments on EBay in JIS+washer head or Allen head style.Add your own oiled washer / Loctite appropriate to the situation. Just as good as an OEM MEC bolt of the same grade imho.
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