I have a Fiskers and several other brands in different sizes too. I always use the Fiskers 45..its my go to, but I have the same problems as you. I did manage to put an Olfa blade in it the other day...jammed it up and thought I was going to throw it away, but DH fixed it. Scared me to dead, there he was tugging on a BRAND NEW BLADE with his bare hand!!! Yikes!!!
I do need to get one that locks the blade IN when I put it down though. I have a bad habit of leaving the blade out and I cut my finger last night when I barely hit it on the blade. Had to stop cutting and go for 1st Aid.... :roll: