Originally Posted by
Eggman84
I just went back and reread your two posts, You originally said you were having problems with a Shimano 10 speed DT shifter working with a 10 speed cassette. Your 2nd post then says this "setup" was working fine with a 9 speed cassette. No wonder the it isn't working right, You appear to be using a 9 speed DT shifter. Go back to that Art Cyclery website and you will see that a Shimano 9 speed shifter pulls 2.5 mm, which is essentially what you measured 2.45 mm.
So what is the Shimano DT shifter part number? Then use that to verify if it is for 9 speed or 10 speed cassettes.
I noticed the same thing reading those 2 posts. If shifting was working on a 9 speed cassette, it cannot work on a 10 speed cassette. Limit screws are only there to keep your derailleur from shifting the chain off the cassette. Once they have been set, they have no function for shifting improvement