Urgent Ignition Lock Advice Needed
 

I just installed the new lock mechanism and switch on my 92 300E.To slide the lock assy into the steering collar I had to press in the little button and align into the old hole where I drilled out the old button. How do you get the button to release now and hold the assembly in the collar?For some reason I can't get the tumbler to install and the key to turn.Any advise???