re the Parabellum is Back book, these may help answer the washer question
p273 - picture of all MP parts laid out flat like used in the booklet
p274 - picture of standard MP axle pin with integral large flange ( best evidence )
p377 - picture of receiver with machined for large axle flange radius
p413 - picture of the axle pin assembled in rear of slide ( next best evidence )
the above all show one piece pin and flange
so still seems to me your MP somehow has a fractured original axle pin
maybe original pin was too long overall or bad metal or heavy power ammo or pin flange oversized or slide pin flange recess undersized or pin body undersized - seems like anything that puts actual recoil pressure on the edge of flange would fracture it
lugerdoc may have a NOS MP axle pin which seems you may need one
good luck !
Bill
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