Adhesives work well and they are used successfully in the aircraft industry, BUT there are stringent requirements that must be met to be 100% reliable such as best choice of adhesive, surface preparation, method of joining parts together for adhesive curing and controlled temp and pressure of adhesive cure cycle. Many places in a production line where errors could occur and with some objects, not possible to do 100% testing of each bond joint. Probably not a good method for chainsaws with their large temperature changes and vibration levels and if done correctly not cheaper then a few screws.