LOOKING FOR INFO ON BROKEN SAFETY SPOOLS

I'm trying to get a better idea of the extent and nature of breaking
hammer block spools, particularly if any are sn-pk030______ and up.
I don't have confidence that Walther/Umarex/Smith will do their duty.

I need the first few numerals in serial numbers, and date code(AK,BA,BB)on
the slide, and pics if available. (at least a description of the break)

I only know of about 7 to 10 broken spools, but there must be more, possibly
many more. It seems that 2009 guns had the problem, but maybe not 2010 guns.
Looking at recent PK's, I see that the spool color has changed to flat black.
This might indicate a change in metallurgy or processing.

A comment here, or email to ebrownee@gmail.com would be useful.
.