Reading the Premier Power guide it talks of the oil tank fitted to a CSR. And in point 3 talks of “remove the drain plug on the right hand side of the oil tank”. I have the 420-style triangular tank. There is a small grub screw on the left/front and the drain plug in the base purportedly made of cheese. And the bottom oil pipe. Which, if any, corresponds with the CSR right hand drain plug?