Issue new shares to reflect the agreed shareholding structure and do it with the aid of a lawyer. Right now, based on the information you provide, you do not h

Issue new shares to reflect the agreed shareholding structure and do it with the aid of a lawyer. Right now, based on the information you provide, you do not have a 50/50 split. It still stands at 60/40 and if there is ever any dispute over it, its your word against his. Handshake deals and verbal agreements are alright but your best friend in business is a solid, written, legal contract (disclaimer: IANAL)