[olstyn]

I'm not sure how close they have to be, but if you juggle those pins around, putting the heaviest pin with the lightest piston and vice versa, you wind up with the heaviest set being 507.0 grams and the lightest being 493.1 grams.

Average = 502.0g

Piston 1 + Pin 3 = 493.1g (avg - 8.9)
Piston 2 + Pin 2 = 499.3g (avg - 2.7)
Piston 3 + Pin 1 = 505.6g (avg + 3.6)
Piston 4 + Pin 4 = 503.5g (avg + 1.5)
Piston 5 + Pin 6 = 503.6g (avg + 1.6)
Piston 6 + Pin 5 = 507.0g (avg + 5.0)

Definitely an improvement, but is that close enough? Also, out of curiosity, is pin #3 noticeably smaller than the others or made of a different material or something, given that it's 18.5% lighter than the average of the other 5 pins? If you could replace it with a pin about 9 grams heavier and pin 5 with one about 6 grams lighter, you'd be a lot closer.

Assuming pin 3 is replaced by a 9g heavier pin and Pin 5 is replaced by a 6g lighter pin:

New average = 502.5g

Piston 1 + New Pin 3 = 502.1g (avg - 0.4)
Piston 2 + Pin 2 = 499.3g (avg - 2.8)
Piston 3 + Pin 1 = 505.6g (avg + 2.1)
Piston 4 + Pin 4 = 503.5g (avg + 1.0)
Piston 5 + Pin 6 = 503.6g (avg + 1.1)
Piston 6 + New Pin 5 = 501.0g (avg - 1.5)

Disclaimer: I am not an expert, and I just did this math after getting home from a 10.5 hour shift @ work, so I'm a little brain-fried; before using my numbers for anything important, double-checking them would probably be a good idea.