I would like to setup shipping by weight using Cubecart 4, but haven't a clue, I've read through Cubecarts support but still can't work this out. Beneath is how I would like things working. All orders are in the UK.
Up to 900g - £3.90
1kg - 1.5kg - £5.72
1.6kg - 1.7kg £6.42
1.8kg up wards £7.50 (will be a flat rate via courier)