I assume you are working to a known 'bob-weight'?

You do end to end balancing along with beam 'parting-line' polishing to equal the whole rod.

Yes you can put a heavy rod with a light one and then mix and match pistons as well.

But anyone who have balanced a crank knows the slightest change can affect the overall balance.

This is why we buy aftermarkets, the whole balance issue and durability is removed.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...