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Books, not bombs
I'm sure I'll change it myself. The tool is about £28 and straps £50 +It's a regular strap. Why can't you change it yourself?
Your watch is the 6653, I think = with a regular lug width of 22mm.
Watchgecko do nice straps.
You will need to measure if the width of your existing strap tapers down from 22mm to say 20/18mm.
Your deployment clasp can be used on ANY strap, provided it has the same measurements.