So I went to just reseal and do some general maintenance catch up on the 2zz I purchase from a local salvage yard and of course the intake lift bolt was broken off. the rocker shaft was slightly rotated in the head not allowing for any type of extraction so I went with the Toyota TSB style removal of by sliding the shaft itself out. It's on a stand so access to everything was no problem but I had to beat the hell out of the shaft just to get access to the lift bolt. So bad it ruined my 3/8 extension and the shaft itself. Again no choice since the shaft rotated and a 1/4 of the lift bolt was under the casting. I did manage to get it out but the lift bolt gouged the head pretty good in the process. Solid 1/32 deep channel in the casting on the cam gear side. On top of that the other end mushroomed a tad damaging/scratching the bore a bit all the way through. I just wanted to see the sanity of my plan to try and wrap the end of 3/8 steel tubing I have in emery cloth and deburring the bore. Then just put in a new shaft and call it done. Of course I'll flush everything well before it gets sealed up. I am assuming that as long as it's clean the damage won't harm anything since it's really just a channel for oil to get to the lifters. Any seepage through the damaged channel would just leak out into the timing chain area. Or am I missing something? Anyone experience this?