This is the correct lock and keys for this machine!  Don't be fooled by others that you see online that use a barrel key.

The Glasco Coin Mech is also seen on Ideal machines.

If you need to drill this style lock out to replace it...start with a 1/8" drill bit.  Drill into the very center of the lock about 3/4".  Continually enlarging the hole until you get to about 1/2".  At this point if you have done it correctly the coin meachanism door should open.  You will find the stud from the end of the lock still in the nut.  Unscrew the remnant from the nut, take the big nut off the back of the door and replace the lock with our HP20G.