there is an end but you just do not know when you get there, remember you are dealing with something that was likely made before men were walking on the moon and things tend to rust even when properly stored.
if your Allen fits snugly do not try and force it, pb blaster and time is your friend here soak it down and wait a day or two, if you think spray it down 2-3 times a day and i have found most things will come loose.
if it is as loose as you described you may want to remove PTO and inspect every thing to ensure there is not to much wear on the shaft.
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