318 instead of 273

I use loctite on the threads to hold them after adjustment. Just don't use the HD stuff but the removable lightweight loctite. Just one drop on each screw

http://www.all-spec.com/products/24205.html?gclid=CL6n17nXo64CFUcQNAod2iPLTg

I would send the other stuff back for a refund, IMO