Fibwr optical

[MarkP]

Now that I think about it I mixed the anchoring cement really runny so it would readily go into the narrow space between the pipe and the walls of the hole. I bet a lot of it went under the end of the pipe and into the middle. I had left some crushed concrete in the bottom but removed most of it just before placing the pipe. One nub of rock holding the pipe up wold allow space everywhere else.