Olfa cutters, and especially the ergonomic are my favorite, too. Did you know they are guaranteed for life? They will either repair or replace your cutter with the same type of cutter for free. You only pay the postage to mail your ailing cutter to them. You can get the info here.
http://olfa.com/CustomerServiceGuarantee.aspx
They are fast to respond, too. I received mine back good as new in under a week. Best of luck to you.