I think the SM300 is better suited to a strap and it's gonna look great as you can see in Civilguy007's shot.
I can't offer any advice but In the next couple of days I'm also going to be attempting my first strap change. I was going to take mine to the OB but figured I've got to do it myself at some time.
I thing I've got the correct Bergeon tool so.....plenty of tape, a good stiff drink and hoping for the best.
Good luck (to both of us)
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