Can we chalk this up to skim reading a thread and over zealous posting while trying to help??
It can be easy to miss posts which may hold important information and to be honest there aren't many people on this forum (myself included) who have yet to post repeated or mistaken information/ advice.
Arguing the toss on a thread and in doing so taking a thread a long way off topic is not needed

Ik posts a suggestion that had already been made at least once in the thread and questions why the OP asked the question in the first place,
Dell points out the repeated information and questions Ik as to if he has read the entire thread,
Ik seems to take offense to this and answers in a slightly terse and off hand way,
Dell posts querying Ik's latest post,
Ik seems to take offense again and replies,
Dell posts...
Ik posts...
Everyone else wonders when the thread will get back on topic and Ik and Dell agree to disagree