I realy wasn't looking forward to maching the recesses I'd ran through it countless times in my mind with some wierd and wonderful ideas, but wonce I'd got the parts arround me I decided to keep to the simplest method.
So for the frame I just bolted the back plate to the frame, clocked it up square on the mill table.

Then centred the mill on the bearing housing bore in the back plate.

sorry about the crap pic.
Then using the boring head bored out the recess.
sorry no pic.
This is it finished.

For the inner piston again this was squared up on the table, and using the edge finders it was centred under the mill
At this point thing got hairy.
I had the boring tool sticking out of the side of the head as i thought this was a less flimsy set up but it ment I had to run the mill in referse, this worked fine for the outer frame.
But I didn't realise the mill head was screwed into the morse taper mandrell, this time the bugger unscrewed.


This gave me an involantry bowel movement, after a shower and a change of pants,

things wern't as bad as they looked the part and boring head wasn't damaged.
So changed to this method i was pushing the capacity if the head, but by taking small cuts it all worked out.




Hopefully that the worst bit over, its getting close to the moment of truth.
Stew