If I were you I would contact this genealogy society to ask for help. If they do not have the time to do the search they may be able to suggest someone local who could do this for you. I would also keep an open mind that there may be interesting information about your grandparents out there that you do not yet have. Never leave any stone unturned in research, as you never know what treasure you may find. Among other things this library has surname files which contain information provided by other researchers, and copies of the information the society provided to people who wrote to them asking for information. (I accessed them during my visit.) The web site information indicates Hasler and Wease are among the surnames in their collection.