I've always required a 20% deposit from anyone for their first knife. After the first knife is delivered, I don't ask for a deposit on the second or succeeding knives. At that point, the buyers and I are friends, and they trust my work. I trust their ability and willingness to pay from that point on.
The 20% deposit is not refundable. If the buyer doesn't accept the knife, I keep the deposit. This has only happened twice that I remember. One man went bankrupt and didn't have the money to buy the knife, the other decided he didn't like it after it was finished.
Nearly everyone I deal with uses email, so I keep the buyer informed of progress, and send him pictures as the knife progresses to the finished state; then another email with pictures of the finished knife, and asking for the final amount due including shipping costs. I ship the knife on receipt of the final payment.
All the emails and pictures of work in progress make an unimpeachable record of the origin of the knife, along with all commitments and agreements between the buyer and maker.
When I accept a knife commission, I give the buyer a set delivery date which will be the latest date the knife will be ready to ship. I have never ever been late, and usually beat the delivery date by a few weeks.
Getting the knife made on time is always on my mind. Everything else comes second.
If a knifemaker makes a commitment, he should always honor it, even if something else has to slide a little. If you don't do this, people won't trust you again.
