This trick with bleeding at the banjos, does it compromise the seal that the crush washers make?
It's not something I do unless I've had the banjo off completely, but I've never had a problem re-using the copper washers. Just make sure you don't get dirt under them. So long as the area is clean and the surfaces are undamaged they reseal fine. The tiny deformation they undergo when the banjo is nipped up isn't enough to work harden them.
Copper washers are too cheap to not replace them. It also takes les torque to seal everything when one puts new copper washers. I always replace.
