Macgyver, I am disappointed that we have not heard from you regarding the noise. This is a "whatever it takes" scenario. I do not care what you must do, but I gots ta know what is making/was making that sound. FTM, far too many folks have contributed to or just read this thread for you to walk away. It is particularly irresponsible to waste our time like that after seeking our help.
Having broached the subject, IMHO, you are now honor-bound to figure it out and let us know. Should you fail to do so, I must regretfully inform you that you may be the first person to EVER qualify for my ignore list. This is just that serious. You knew/should have known the job was dangerous when you took it.