Chainsaw chains stretch during normal operation and begin to sag on a saw's guide bar. If a chainsaw chain is allowed to become too loose, it can easily come off the bar during operation and...The best way to avoid kickback, however, is to avoid putting the tip of the chain saw bar against the wood. Step 6: Make sure the chain brake on your saw works prior to use. Step 7: Pay attention to the nose of your chainsaw bar and how it is positioned. Step 8: Choose low kickback chain saw chains.