You will be messing with it until you decide to actually fix it. I used long 3/8 extensions to tap the tube down into the hole. Put a worm gear clamp around the tube for the extensions to tap on. There are pics somewhere. Perhaps a search will turn them up.

I basically followed directions in a thread titled "Leak free 617". All diesels leak - only when they haven't had the proper care taken to maintain them.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.