I've had a 684 in the drawer for a couple of years. Every time I look at it I think "Um......no.....not today".
And the 661 is even smaller. While a millimetre or two doesn't seem significant, it's a rule of exponential proportionality (my rule).
Each step down from 30mm gets twice as complicated, so by the time you get to a 661, you're either in trouble, or "oh, I have to go and clean the latrines" sort of deviation.
I respectfully decline your offer.
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