Having been back to the drawing board I've used the following £29
39mm Truss clamps eBay181375831564. £14
Stainless eye bolts £ 5
Classic mini rocker cover rubbers & washer kit
eBay 182132750918 £10
Stable, cushioned, removable and it works, the clamps stay attached to the rack when not in use, no drilling or badly designed fitting to install
