I have wooden sanding blocks for D wide bore chanter reeds by Cillian Ó Briain stamped with 82mm and 70mm curvature measurement.
I have another wooden sanding block I got years ago from NPU with no stamp for curvature measurement but diameter is around 43.6 width which I have used for narrow bore chanter reeds.
Have made reeds for my Joe Kennedy applewood narrow bore D chanter but now need 40-41mm diameter wooden sanding block as used by Joe Kennedy and Geoff Wooff
So what is or how do you work out the curvature measurement for a 40 and 41mm diameter sanding block.
You could turn a piece of hardwood to a cylinder of 40 or 41mm diameter. If you don’t have a lathe I am sure you will find someone locally who would be willing to do this for you. And if you are REALLY stuck I will make you one.
That’s what I use, PJ. It’s white, 41.6mm, and SCH 40. Extremely rigid. You can buy it in short lengths too. There’s also a black one, slightly larger, in ABS.
I like repurposing things for sanding cylinders and other reed tools. Paddy Keenan likes long necked beer bottles. I have a shampoo bottle, PVC tubing, copper tubing and a length of an old oar handle as cylinders. My mandrels are filed from welding rods, as they were free. The most expensive tool I have is a dial indicator which I rarely use. My gouge started out as a used out canel type found at a yard sale. A rechargeable small screw driver ($2 at a yard sale) made a handy tool for binding reeds. I invested time rather than money on my tools. I have a lot more time than money.