Third try at writing this. While waiting for the boring head to arrive I made a couple of V blocks, to hold the shaft to bore out the damaged section. When the head arrived, I discovered that even with the shortest boring bar, the head of the mill was too low by 5mm. I ended up taking it around to my mates sons place, as his mill is a Koenig I think it is, with plenty of height and all the necessary goodies. 2 weeks later I get a phone call to say that he's doing it today. I'm invited around to help (perve on the tooling) set it up etc. after 3/4 hour setting it up were underway, great watching a machinist set stuff up on the mill, setting the centre was easy using a cigarette paper with digital readout, (note to self, must get one when I get a bigger mill). Half an hour later, jobs done, bored out and faced level. His boring head has a collar on it that you hold and the cutter slides out under power, nice clean finish.
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Next job was to make 5 bushes, 2 the same size for the bearings, 1 each for the good side and the damaged side, which cleaned up very nicely. Another was made to run the helicoil tap through, first to suit the oversized side, tapped, and then turned down to suit the other side.
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This is how they connect, the 2 "hats" sit against each other, as it's the only way of assembling it.
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This is the other side of the bearing with the CV boot, when everything disintegrated, the original cover was pressed in after the bearing and then peened over to hold it in place. As it couldn't be used again, I had to make a suitable replacement.
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The original plastic boot was damaged also, a new one was made from plastic bar off cuts POM I think it is.
The bottom one was also replaced, as there is a circlip underneath. To get to it I had to destroy the original, thereby having to make a new one also.

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Showing how the rotational motion turn into an oscillating motion
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Kryn