I bought a replacement alloy blade with a fibre optic bead that is so much nicer then the orginal, I can't remember the guy's name that makes them down south but he also sold me some metal adjustment screws to replace the plastic ones that break.
Wasn't very expensive and a huge up grade.
If you really want the same plastic parts I can send you mine if you pay the shipping.
It wasn't Tandemkross that I dealt with,but it looks like they have the same stuff....
http://www.amazon.com/TANDEMKROSS-Sub-2000-SU-16A-Adjustment-Screws/dp/B00I1TXPZO