O.lifting help

[2noob]

Hi all, im new to olympic lifting. I have a problem that i need help with.
It is the overhead squat. When i do a normal squat or front squat, my shins stays vertical throughout the whole down and up movement the weight stays on my heels and i push with my hips. However when i do overhead squat my shins moves forward towards my toes, this means that all the weights are concentrated on my toes instead on heels and i can't push with my hips. THis puts a lot of pressure on my knees. If i try to make my shins staying vertical i could only go 1/4 of the way down and it feels awkward as i cannot lock the weights overhead and feel like they are tip forward. Are there ways to improve my locking problem as well as the squatting problem? Thanks!!

 

[russy_russ]

You're going to have to lock the bar above your head slightly behind the medial frontal plane. It took many tries to learn balance points before I got it down perfectly. Each time I went slower and lower to build stability and balance.