>Other than the obvious cost saving it
>offers no advantage of which I am aware,
>and makes it much more difficult to take
>the knife apart for cleaning.
The bottom line is that screws aren't an unqualified improvement. They have some advantages and some disadvantages.
Avantages:
-Disassemblable for user service
-User-adjustable pivot tightness
Disadvantages:
-Greater expense
-decreased strength
-Increased demands for warrantee service due to botched reassambly
Now understand that the two advantages are knife "luxuries". It's very easy to do without them. The overwhelming popularity of rivited Spydercos proves that. But the disadvantages can have a serious adverse effect on the product in the marketplace. Remember that "knife people" are only a very small part of Spyderco's business, especially for popular models like the Delica and Endura.
If the price increases, the average ELU (who's probably already stretching his budget for a knife) will be inclined to look elsewhere.
If the strength decreases, Spyderco's will get a reputation for breakage (although this'd probaly be a bigger issue on the SS models...)
And just as importantly, the warrantee service issue would cause Spyderco no end of headaches. How many Delicas, Enduras, and Rescue models d'you think are out there? tens of thousands? Hundreds of thousands? Millions, even? Imagine that each one is in the hands of a curious ELU with a screwdriver. Spyderco is bombarded with warrantee requests for knives that were improperly reassembled. They have three options:
-Honor the requests, despite the fact that the customers voided their warrantees, at what I can only imagine will be a large expense (the repair shop would spent twelve hours a day reassembling Delicas and replacing stripped screws)
-Refuse to honor the voided warrantee, and end up with tens of thousands of dissatisfied customers who'll be less inclined to buy Spydercos in the future (Remember, Spyderco serves a huge market that isn't very knife-savvy; the greatest asset is trust in their brand name. If cops and firemen and rescue personnel see a wave of stories about Spyderco knives breaking and the company refusing to fix 'em, it could be disaterous for business)
-Rivet the knives together and avoid the whole issue.
Look at it from Spyderco's point of view:
Change the tooling on your most successful models while raising the price and inviting headaches for themselves and the enormous majority of their customer base, all in order to meet the _desires_ of a tiny fraction of their audience... Or leave well enough alone.