Take a big screwdiver and puncture the old filter to get it off if you have to. (instant wrench but messy)
Oil filters (regardless of what Triumph says) go on hand tight.
Quit buying Triumph's filters and get ones that have their own tool built in like this one:
http://www.newbonneville.com/html/oil_filters.html
They can't void your warranty for not buying their oil and filters, as long as you use oil and filters that meet the specs they call for.
-Ben
