I am unable to loosen the allen bolts on my planer head. I have only been able to remove one and have hollowed out the heads of several and broken a few hex keys. I sprayed some penetrating oil but it has not helped. Is there any advice to be had, or do I need to throw this cheap ridgid planer out (which I am tempted to do for a number of reasons) and start over? I am extremely frustrated. Please advise.

Thanks, as always.