I was able to get the bar guard on this morning without draining the pond. Took about 30 minutes to get feeling back into my hands and glad I don't have to repeat this job. The pipe was about 8" below the water surface so I was able to drill a couple of holes in the pipe with a long bit and secure it with some 1/2" wide heavy plastic zip ties to make sure it doesn't pull out of the pipe.

[Linked Image from live.staticflickr.com]2021-01-04_10-33-05

[Linked Image from live.staticflickr.com]2021-01-04_10-32-59