Weird Noise

I have had flex plate bolts back of a little and that coused a noise similar to a rod bearing or a light knock. But it was difficult to tell where the noise was coming from.
When I pulled the tranny and inspected the flex plate all the bolts were slightly loose and the holes were slightly oblonged or oval.
I think 67DART273's idea is a great way to isolate the noise.
.The noise is likely to return.