I've added additional weight options via products_attributes.php, but this just shows the options on the product page without actually editing the products weight.
For example, I have a product weight of 30grams. I then add an attribute allowing the customer to select 100grams (with the necessary price increase),
but this does not add 0.07 to that product weight - it still just keeps the original weight of 0.03 in the shopping cart.
This doesn't work because my shipping is based on weight!
Is there a solution for this?