Tapestry loom ???



I have refurbished this vertical tapestry loom but I don't know what type it is. I thought it was a Glimarka but they say it definately is not. I would like to know what kind of loom it is and I also need to know how to warp it. In particular the beams (top and bottom) have a slot that a 1x1 wood slat fits in. I suspect it is to hold the warp in place but I can't figure out how?? Any help is appreciated. Thank you. 

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