I am not sure about your 124 , but on my 126 there is a hole on the side of the tunnel cover that you can see the spirol pin , but that is only when you have a creeper gear. It is on the right side as you sit on the tractor.
I took my punch and put it in the ratchet end of a long 3/8 drive extension and drove it out. You may want to use a junky extension because you have to hit it pretty hard to get the pin out and you may round over the socket end.
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