My little saw came with a 20" .325" .050 80DL bar that is now done. Took it to a local shop and they sold me a pro-lite plus 20" .325" .050 78DL bar. Didn't put it on for a couple weeks to find the mistake, don't have the receipt and they won't exchange it. I have 4 new 80DL chains and 4 currently in rotation. I assume the cheapest thing for me to do is remove 2 links from them and use the bar I can't return? Is shortening my chains something I can/should try myself? I have an Oregon chain breaker and rivet spinner but have neither used nor seen them used before.