Oh yeah, it's ugly. OMG, it's soooo ugly. But it works.
I had a couple extra standard chain tensioners, and an idea I had to try. I beat one piece straight, PC-7'ed a bolt in place on another piece, went to ACE and tried to explain to my friendly hardware man what spring I thought I needed and why.
The end result is Frankenstein's Chain Tensioner. Pics follow.