Furnished content.
(from Lumberjocks.com)
This similar jig was originally made by one of my co workers and myself from metal and used on inserting wood inserts for wood floors and other materials while I was still in the trade. I passed it on to my son after I retired 10 years ago. We called it the adjustable framer or GIG. Later It was nicknamed by the guys as the GIGGOLO.I made this jig about 8 years ago while I was setting up to do sign making. Remembering the giggolo I thought this could be something that may come in handy. I can set the wood in the frame clamp it down and by using different bushings on the router I could change making a border around the wood. LittleBlackDuck posted a adjustable oblong routing jig last year and I got the idea to use it to cut grooves on cutting boards. I also use it to hold mitered box side panels so they don't fall as I'm checking on the fit. I also used it for temporary clamping. This has many different uses if you use your imagination and could come in handy for something or not.Start off by making 4 rails any length you like. This can be done with a keyhole router bit. Since I have a endless supply of bamboo flooring I chose to laminate 3 pieces together. The two ends I cut a dado in as you see in the pics and the middle piece is shorter to create the slot for the T bolt. Which ever way you go you need to start with the four rails.
Then the end caps which have the tightening knobs also. At this point I made my own knobs and threaded them with a wood threader but you can also buy knobs if you choose These are for 1/4-20 bolts. Keep in mind the knob can not be thicker than the thickness of the rail or it won't sit flat. There is a small spline inserted as you see in the next pic. It goes in the groove of the adjacent rail and aids the sliding and also keeps the rails from going willie wonky.
That's pretty much it but if you have a question please ask.
Hopefully this can be useful to someone. I use it quite often and it's one of the many jigs that didn't get thrown out a few months ago.