Of course, now we do not want to cut into the nice, pristine, virginal surface, do we? Since the track hinge positions the track for a repeatable saw cut, what is needed is a replaceable insert for a saw kerf. The plan was to make this with a sliding dovetail. This could be left loose and removable, yet be solidly attached.
Marking out where the insert will be fitted ...
The track and saw are used to kerf the outside of the insert. This is 1/2" deep ..
Remove the waste with a power router ...
... and level with a router plane ...
I had made two inserts (one a spare), and these were doubled up to create an angle guide for a chisel. The dovetail was created this way ...
Insert installed ...
And, finally, a board was sawn using the track, leaving a fine kerf in the new insert ...
More build to come ...
Regards from Perth
Derek