Hi All
Thanks for the comments, much appreciated. The picture below shows the jig I made up. Not a new idea, inspired by young Terry Scott who used a similar set up in many of his multi centre pieces. The 1" MDF backplate is screwed to a 13" faceplate. Glued and screwed to this are two V blocks made out of Douglas Fir. Two mild steel straps are then fixed to these to hold the block of Oak in place. In hindsite, I would have placed these V blocks a bit further apart as they restricted the actual turning area. It was counterbalanced with a chunk of steel and turned at about 500 rpm. The photo shows the first hole already turned and the block turned through 90 degrees and moved up the jig a bit. I marked the top of the block on the faceplate, so the when I turned it round, the hole would be in line with the other side. BHT, the top and bottom have been sanded by hand to 600 grit and oiled. I am hoping that the pic is big enough as the origional pic I took was at high resolution, and I had to resize with my camera, as the piece was finished. Hope this is a good enough description. Have a go. I am going to take this idea further, so watch out for more. Thanks
Roger G