Pt.1 Shimano 105 5600 10 speed shifter: Rebuild service clean dissembled

Vintage parts weights.
Lots of information on calculating cog pitch, pull ratio, cable pull for derailleurs and shifters.
Most road bikes today come with integrated brake and shifting levers, or brifters. They are more comfortable and usable than traditional styles. Let's look at some available options.
Shifters work by increasing or decreasing the tension on the shift cables to move the derailleur into place.
Indexed shifters click into place and move the derailleur one gear. They allow for precise shifting, but need to be tuned and parts are made for specific speeds and derailleurs. Brifters are all index shifters.