My 912 UL has a stuck filter. Its on a model IV. I put it on by hand 50 hours ago, I can't believe how stuck it is. I was using a strap wrench and have damaged the filter already, so, wondering, who has had this issue. I haven't cracked it or creased it badly but short of taking off an exhaust pipe to get a better grip, I"m kinda stuck, any ideas?