Originally Posted by
Phil_gretz
......You begin with the Low screw. Chain back in place, and on the inner chainring and rear innermost (lowest) cog. Begin to tighten the L screw and watch the cage move outward, until the inner edge of the cage (that contains the chain) just makes contact with the inner edge of the chain. Back it off until there's 0.5mm or so between the cage and the chain........
I ABSOLUTELY don't recommend "jacking" the chain ring over with the limit screw.
The DER metal tends to be "soft" and doing so will result in undue wear on the threads.
You can hold the FDER over with your thumb and turn the screw some. Repeat as necessary.