Sadowsky at one time did use Warmoth parts. Something to do with the smaller builder vs the cost of owning a CNC machine. Here's Roger addressing this subject (an excerpt from the TB archives)
"I guess it is my turn to join this discussion:
1) Several people have posted and commented that Sadowsky uses Warmoth parts. I would like to address this for what I hope will be the last time. I did use some Warmoth parts during the 80's and have ordered an occasional neck from them for some of our repair customers during the years. However, Sadowsky has not used any Warmoth necks or bodies on their basses for at least the last 10 years."
" Many instrument companies use subcontractors. It is very difficult to balance quality and maintain costs. If we were making every body by "hand" (which no one really does), costs would be absurdly high and consistancy would be very low. The average cost of a CNC machine (a computerized carving machine), with software, is about $125,000.00. Because that is beyond the means of most of us "smaller" guys, there are companies that own these machines who make parts for the "rest of us". Sadowsky, Lakland, Lull, Turner and lots more of us use various subcontractors. I know this takes some of the "romanticism" out of the process for you, but that is the way it is."
Some will still think Warmoth built or end user assembled as "not as high quality" as some boutique builders but actually they're as good they just lack the name tag.