After considerable thinking and the distance to the nearest M B service center I have decided to pull the head off and do it the conventional way. By the time I could find the compression tool or have one made up from a pattern the job would be probably done. Unless of course I open up a can of worms and one thing leads to another etc . At least I will be able to check it all out.
I will block my nose and jump in so to speak.
Thank you for the responses and I will probably come up for air next week sometime. lol.