@ZoneIII this just happened to me just as you described it. Had removed the filler plug and drain plug for bevel box and was flushing it with gear oil. Most of the gunk appeared to be out, so I started to put the drain bolt back in. I was using a digital torque meter set to 15 nm when the bolt started spinning. It also will not come out. I also tried using vise grip needle nose pliers to try to pull and turn at the same time to no avail.
My understanding is that the bevel gear/final drive unit is a sealed unit. There is not a way to open it up to get at anything which may have fallen in. Can someone comment on whether this understanding is correct?
If so, even drilling the bolt head out so that it detaches from the bolt itself, would still leave the remains of the bolt and/or the magnet in the final drive which could be disastrous if those pieces jammed the gears while underway.
I have read where others have drilled out the plug, retapped to a larger size bolt and added a crush washer for a seal.
I have also read where others left the bolt in place, since the bolt was not leaking, and they drained/filled the gear box with oil through the filler hole by removing the final drive.
@Idaho Red Rocket 3, you said you just kept pulling and twisting until it "broke in half." By that do you mean the head of the bolt came away from the bolt itself? How long did you do this before it happened? I kept pulling and twisting with the vise grip needle nose pliers but nothing was happening. Should I just keep going until something happens? Then try to get the remains of the bolt out with a small screw driver?
Thanks in advance for any help.