A newbie to this site. Just got a 2018 Kodiak 450 eps lightly used. There's not much on line about servicing this model yet. I want to know how you remove the foam filter from the filter frame. Watching you tube, it shows that the end cap pops off allowing the foam to slip off the frame. This is done on a Grizzly 700 not a 450. I can't get either end cap off. What's the secret? Thank you in advance.