Silly question but why such a high risk process? Why not scribe a circle, roughly cut it out with a thin cutting disk on an angle grinder and then finish to the scribe line with a grinding disk. !0 min job, no bits of metal flying around, no damage to your lathe, body intact.........
Jon
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1950 Land Rover series 1
1967 Land Rover series 2A LWB
1986 Land Rover series 3 SWB
1938 DKW SB200
1944 DKW NZ350-1
1967 Ural K750 sidecar outfit
1944 VW Kubelwagen KDF82
1942 Steyr 1500A
1944 Morris C8A
1943 Chevrolet CMP8A HUP?
194? Bedford QL
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