Recently purchased a Delta JT360 jointer. When I finished assembling it yesterday, I discovered I had 4 lock washers left over. I suspect they belong on the motor mounting bolts, though I re-read the instructions several times and don't see any mention. They aren't on the parts list.
(The parts list also only lists 36 5/16 flat washers, but 40 are required and included. However - not speaking Spanish so I'm not 100% sure - the Spanish parts list does list 40 of these washers! So I'm suspecting the manual was not written by Ambrose Monk.)
Anyway, I went to the Delta web site to see if there was an updated manual or notice or anything. I can't really tell, because the the link for getting an online copy of the manuals, parts lists, etc., redirects you to another web site that seems to only know about DeWalt tools. It claims not to recognize Delta model numbers, and has no obvious links for manuals anyway. Registering doesn't help. There is also no obvious link to report problems to a webmaster for either site. It took a lot of searching to find an 800 number for support, which isn't available outside 9-6 weekdays.
When I had a problem assembling my Jet contractor's saw (cracked plastic cursor on the fence), they answered my call in seconds and sent me a replacement that arrived in a couple of days.