I have two here at work and one of them has a lock on the top of the blade part that will release half of that area to change the blade. The other just has a small hole that I can slide what looks like a release up and down but nothing releases. This may be an older model of this knife but I need to change the blade on it as it is still in good shape. I hope that someone out there has a similar knife.
This one?...http://www.homedepot.com/h_d1/N-5yc1vZ1xi4/R-100646860/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053
Slide the button up, and wobble the blade with some pliers, it may jammed or rusted in.
Another type has a little lever that flips over..Notice the groove in the new blade, the groove is used to lock the blade.
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