My dad was a custom home builder from the 1920's to the 70's. He would build a house one at a time and take his time to get it right. He would give the buyer a lifetime gaurantee.. My dad's lifetime that is... My mom used to say don't do that, someone might take you up on the offer, she had a lot less faith in humanity than dad did. Nobody in 50 years took the offer. Back then people took responsability for their actions, if they broke it was always their fault.
The lesson I learned from my dad was to always be a professional and do the job right the first time.

When I sell a custom fly rod I give the buyer 30 days, if it doesn't break in 30 days it will never break from anything I did wrong or any defects in the components...FB.