I'm going to build this SST, wonder if I could get a few measurements. I have a picture, I know the ends of the pins are 6mm diameter, and the pins are 50mm center-to-center. I'd like to know the total length of the pins (above the body), and where on the pins is the step to 6mm. I'd also like the larger diameter of the pins, although I'll have to use whatever size drill rod we have around the shop. Thanks.