Just drill at a fairly low speed (100-200 rpm) with your piloted drill. If the liner come loose it will just push out ahead of the drill. Use plenty of cutting oil and withdraw the drill frequently to clear the swarf.
Just drill at a fairly low speed (100-200 rpm) with your piloted drill. If the liner come loose it will just push out ahead of the drill. Use plenty of cutting oil and withdraw the drill frequently to clear the swarf.
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