Thanks Norm and MF,

I thought that might happen. Is it just a rib where the drill might slip off? After thinking about those plastic ones at Bunnings, the plastic is just a skirt to fill up the gap between deck and engine. The metal spacers just clip in don't they. I wonder if I could just grind off the third clip, then use a zip tie to locate the metal bush. The plastic ones at Bunnings look to be flexible plastic.

I still do not know if I will need it. I'll have to wait until those lathe tools arrive on the slow boat from China.

All the best
Jeff