Philip, many thanks for the offer - I found a solution last night whcih worked very well.
I cut some shims from a roll of 0.3mm thick aluminium flashing I had (well, forgot I had since this hectic relocation interstate...er, inter-territory) and this did the trick. I also flat sanded the cast aluminium dec head, and now it is flat, so doesn't touch even without the shims.
All good, but again, many thanks for the offer.
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