Hi Derby and welcome. I can only recall them being discussed once on here and I do think someone had managed to score one and was asking help to figure out how to use it. I think they may have been a bit rare. Maybe try searching on our Community Search function. There are going to be a lot of hits to work through as all the key words are generic such as Porter Cable or stair or stair router jig but the title of any applicable thread should be obvious at least. There may be plans in there for a home made version.
Does it have to be the Porter Cable version? Here is one that I think is still available, and seems more versatile. I have not used or even seen one of these, but ran across their information some time back.
Just in case you don't run into one, Keith Mathewson on Ytube shows how to make one...I made one from his video and have used it many times since. BTW, it doesn't need to be as big as he makes it. And by tacking (screws or small clamps) a straight piece on the back side (to match the stringer angle), you can easily slide it from one step to the next. The only shortcoming is that you need to use the same dimension wedge every time...easy enough to make your own wedges when you need them. Suggestion: If you decide to go this way, keep the master to make more templates in case one gets damaged...
Housed stairs is definitely a job for a router. Looking at the jigs, they all consist of an open L shaped slot , which isn't much of a challenge, The trick is getting the steps spaced equally and setting the jig up so every step is level once installed. Isn't there a table for that purpose? At least a really acurate drawing to scale, will give the height and angle for those of us who are math challenged. That's my usual solution to this kind of cutting problem.
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