If for whatever reason your new Kerfmaker produces either too tight of a joint or too lose of a joint the adjustment is super easy!
EDIT: in the few hours since this video has been on youtube I have gotten more negative response and messages than positive. I understand that if cut correctly your joint should be nice and snug. The simple truth is somewhere along the process of my larger kerfmaker I input the same error not once but twice. I have no problem sharing my mistakes. Apparently the person who originally sent me the message had the same error. The point of this video is to show how easy it is to fine tune your joint. This could have easily been about putting tape on the top side and increasing the gap. My poplar kerfmaker makes joints that are almost too tight for glue. Either way, if you want to increase or decrease the fit of your joint by minimal amounts and not remake the kerfmaker than this will work.