Hi my friend @alfred!
If you are not mentioned in the fellow modeler's answer, you may be sort of "notified" by email, if you have selected this option (where you are notified for everyone's posting at the threads you have commented). So, in your fellow modeler's specific thread you have commented, if he answers to you (in fact, his "answer" will be a posting in his thread), you will see it in your email as a notification, then hit the hyperlink and go to the posting.