Rusty pipe alert:
I sheared off one of two bolts taking an inspection plate off a 40 year old cast iron drainpipe. It is M8 an about 15mm long. I'm supposed to get something that's with 0.15 on a Galvanic corrosion scale, right? You can't get cast iron bolts, so that means wrought aluminum or wrought alloys I think. Amazon has things that are titanium alloy, but I think that would share the Galvanic corrosion of titanium rather than the alu/alloy I need, and therefore be too far away from that of cast iron. Does it really matter for a 40 year old drainpipe?
Oh and the drain pipe wasn't blocked. The snake think I had went straight up easily enough. I need a different one to go down, as there's a right angle involved.