I have been using a 028 for 25 years and would not want to use any other saw. It uses an 18" bar 26rsc .063 guage .325 pitch 74 drive link chain which I am very happy with, and the saw will handle anything I come across. I also have an 025 with a 16" bar and pico chain. I would like to switch the 025 over so it uses the same bar and chain as the 028. To me this would simplify buying and sharpening chains. I have been told that this is not possible, but I still believe it can be done. Any ideas on what to replace?