How and Why to Move Object Centre in PMXE [MMD]

Doing animations had me mad annoyed since i had to use this cane with an extremely off centre. It was from a bundle of random objects from Deviantart, all good stuff but you can tell they were mass produced due to the bad centres and being named "anjdhaa;dhjsfp1903721-38" so you have to re-centre and re-name them all piece by piece. That's life at least i got it for free lol.