ENGINEER PZ-58 Screw Removal Pliers Stripped Screw Extractor (Combination Pliers) Unique Non-slip Jaws for Damaged, Rusted Fasteners. Made in Japan

This happened to me as well! Ordered these guys and was able to finally force it the hell off. I too used the tool that comes with the saw and it stripped the screw head right away. https://www.amazon.com/dp/B002L6HJAA