No problem, if you have placed and order but realise that you need some more parts then as long as we have not printed the postage lablel you can just place a second order and we will combine the two and calculate the shipping for both and refund the difference to you.
Of course it is always better, and less work for us, if you can place it all at once but we understand that there are lots of bits and pieces and easy to miss a set of screws or something bigger.
It is always helpfull to get a contact request letting us know that you have two orders.