Once I bought a used Lynx and didn't like the riser it came with. I sent Dan another Lynx riser I had that I liked for him to match. When he found out why, he offered me something for the riser I didn't like. Don't expect much, but it's going to be better than holding on to limbs you don't need. I assume a bowyer would only offer to do this if he were making something new for you, so he would still be making a profit. He's more or less giving you a discount on whatever he's making for you, which he might make up someday if he sells the limbs you send back.