I was just using mine over the weekend, taking a resin seat off of the block, and it worked like a charm!! I used an Exacto one, but rather than buy it at the LHS or MicroMark ('cause they're a bit more pricier), I bought it at the local craft store (Michael's) for around $6.00. It came with 2 blades, and a handle. I've tried the #11 blade trick also, it works ok, but if you don't score deep enough, you'll snap the part (I learned the hard way).