My 2001 Accent had a difficult gear change and the Hyundai dealership upgraded my gearbox with a double cone synchro kit under warrenty. They said it was a common modification to Accent transmissions. Doesn't really answer your question but I hope it helps.
Having owned a 2002 Accent and now a 2005, I can say that the shift effort on the '05 is alot better than on the 2002. For example going from 1st to 2nd I found with the old Accent that you had to go a little slower shifting than with the 2005. I would attribute this to some kind of improvement to the Synchros used in the transmission.
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