Just an idea ...... Can this guard on the front sprocket be the culprit to the noise ? See my picture
About the deflection I measure the lower part of belt from the floor where it's standing on the ground push the belt with my fingers as far possible up measure again and the difference is the deflection. The belt is not made of elastic so we don't need a certain weight or something like that. Or do I see this wrong ?
But .......... from all this, I think we made the biggest step forward that we finally got the feeling that we've been heard by MMC. Mark. Thanks for that !