Hi Toni
I have been using the On Stand telescoping boom for several years with various stands and tablets, but have never found the right one for a large tablet(12-13 in). Your thread got me to searching again, and I found this.
https://www.amazon.com/iShot-Universal-L...13+tablet+mount
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact