New Spindle

Hi Guys

So i have the ox cnc for a few months now from the guys ozznet kit with a makita style router so now i have decided to swap it for a 2.2kw water cooled one.

So today i have mounted everything and i guess the z motor (nema23) doesnt like the weight of it..



Is there something i can do stop it dropping? new stepper motor? or is the spindle just too heavy?

Thanks in advance

Sunil