I don't own anything from Taylor Brands, so I cannot speak to that warranty situation. Most manufacturers will repair or replace parts and even the entire knife if it is truly defective or if there is bad materials used. Spyderco requests you send $5 along with an item to help cover return shipping. Most others will cover that part. Kershaw/ZT will send out screws, torsion bars, pivot screws, clips, etc for free when requested via the correct channels.
The older Shrades were high quality, the newer stuff is mostly flea market garbage made in China. I'd say this is not the norm, but then again not every company mass produces consistently high levels of junk knives like Taylor Brands.