I really dont understand what you want to say by that, and what is your motivation to brag by saying
"Ive spotted a few things on M51s that no one else has yet noticed including Dr M"
If you refer to me by say that you notice things that even me (Dr M) dont notice, than I can only say well dont be sure on that, I know many things on the IDF Shermans including the M51 and other armor of IDF that you even not dream of. The only difference between me and you is that I dont brag like you and fill the internet with mistakes like you regarding the IDF, BUT in contrast to you I documenting the IDF Shermans and other IDF tanks history systematically and accurately and correct many mistakes that fake "IDF experts" like you did over the years because you think that if you visit Israel from time to time and stand near IDF tank it make you an expert, or because you have ex IDF Jeep.
Back to M51 and other Shermans, every thing about them will be published in 20 volumes of Lioness and Liones of the Line that are planed in which vol 1, 2 5 and 6 been already published. I suggest you go back and read them again, so you will continue to learned from real expert.
By the way I am surprised that you dont use the Accurate Armor Muzzel brake on your M51 since all this years you insist that it is most accurate and the correct size since you did the master, bla bla bla......
We say in Hebrew "that the donkey is the one that jump first" so that what I can say to you after reading your post.