22mm Davy is what I use on mine though I have new ‘magnetic’ drain plugs (from TOC spares) fitted to both the engine sump and gearbox. IIRC the original plugs had been abused over the years and weren’t such a good fit for the spanner.
As for tightening, I always use a new copper washer and tighten until it ‘stops’ 🙂
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This reply was modified 6 years, 11 months ago by David Faulkner.
David Faulkner