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Thanks, vealmike,

I will certainly look into that option. I always thought because of the temperature and pressure of injection moulding, the tool had to be toughened steel. 
A softer material might be OK for a smaller run but I will certainly ask the guy who made our tool and the moulder.

I will ask the dear wife to phone around colleges.

Hi Rob im adding my name to the list.After a wet weekend away the Deltas held strong.It very sandy soil on this site as well as Rex said about the top 4".Could have been a emergency put down if it wasnt for your anchors

Cheers Carole, keeping my fingers crossed for a good response. I reckon this could be a good product for beaches and soft soils.

Cheers, Mike, looking forward to any info you can offer.

I think that the only part of the mould that could cause a problem is the piece that would create the cavity for the peg to slip into. If this was machined absolutely square then even a slight rounding of the corners would not create a problem for a while. The actual flat surface of the insert would take a long time to wear away.

I like the sound of this.