I built a kerfing plane from a broken Stanley No. 50 and a piece of plate from
a rip saw. It has an adjustable fence and the depth can be controlled somewhat
by the depth stop on the plane. It works great.
Here is a link to the Flickr album: https://flic.kr/s/aHsmtURphM
Bob PageIn da U.P. of Michigan

    On Monday, November 19, 2018, 12:20:17 PM EST, Nichael Cramer 
wrote:  Basically someone had a badly damaged main-body of a 55.(for example
the screw-adjuster
was broke off, among other things).  So they attached a saw blade to 
the bottom.
Works just fine as a "stair saw".