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The screw easily strips out since it's made of brass; as such, the wheel can't be tightened enough to keep it from slipping.
I have used this tool to mark cut lines for mortise and tenon joints, dovetail joints and guidelines for bracket/drawer slide mounting. Once loose, the scribe marks are not accurate as the blade can wobble quite a bit with only a little play under the screw head. It takes a little practice to hold the tool firmly in a consistent manner so that the lines are scribed consistently. I expect that any tool of this general design will have this issue.This is a useful marking tool, easy to set and makes nice clean marks.It might be nice to have measurements built into this tool rather than having to set the distance against a ruler, but it is very easy to set relative to an existing mark whose distance you want to duplicate.The set screw does need to be firmly tighted and checked periodically to make sure that your distance setting has not changed during use.I have found the need to frequently check that the screw securing the cutting blade is tight. On some of the more expensive marking guages I notice a recess in the guide wheel into which the cutter can be positioned for storage, but that is not a feature of this tool. That seems like a good idea, but the lack of this feature has not caused me any problems.
If you do woodworking and don't have one of these, this one works pretty good. You will use it more than you think.
You'll also need to shim/washer the cutter, to allow it to rotate freely. This is not a Veritas or TiteMark quality tool, but for $10 it is well worth it. Sharpen the wheel cutter, and clean the locking wheel/bolt and it will work quite well. Can't ask to much for $10, but after you fettle it some, it works. It you want a quality wheel marker, buy the Veritas or Titemark, if you're cheap like me, buy this one and fix it up.
This thing doesn't work at all. The marker is not secure, and comes unscrewed when the gauge is used.
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