Several days work.
17 March 2013
Here they are. The homemade replacement grade eight bolts (six required) to mount the flywheel onto the crankshaft. The two black ones are the Mercedes originals that are stretched and failing. The beefier shiny ones are the new bolts that I machined with lots of help and shop-sharing from my neighbor, Don. These are hard steel 10mm x 1.5 pitch bolts that were literally hiding inside some larger 1/2" US bolts. The six flats on the head were milled down from 3/4" to 17mm, one flat at a time, turn 60 degrees, another flat, etc. Threading the hard steel ate up three new threading dies. The new bolts are purposely a bit larger and have about two extra threads to carry a deeper nut, thus spreading the load. There is room for them in the engine configuration.