pto drive shaft to winch drive

i am having problems with an old koenig 100. the bolt securing the drive shaft
to the winch came off and the small shim which pits into the winch input shaft
was lost (Alan bolt). I made a new shim out of old spring and it fits
perfectly, however the 3/8 inset hex head bolt is not providing enough
pressure and the winch still fails under a heavy load. I tried drilling a bit
into that shim and also ground the bolt to fit into the depression and got a
fair pull before the winch again failed. the rotation is starting to score the
input shaft.

I appreciate any ideas....any one ever just drill through the input shaft so
the securing bolt fully penetrates the drive shaft.? I am amazed with the
strength of the winch when operating normally and it is crazy that there is
only a pressure hold and not a bolt all the way through the shaft....thanks
for any ideas....

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