by Skippydiesel » Sun Feb 20, 2022 5:50 pm
Well the oven / freezer technique did not work.
Could be that the freezer is just not cold enough or more likely the small plug gets heated through almost instantly, by the hot brackets (much larger mass).
After some small dimension adjustments to plug we pressed the plugs into the brackets. Followed by a temporary installation to mark the hole position.
We elected to use a nice fresh 1/4" drill bit , pushed through the engine frame bolt holes by hand, as the scribe.
Short up/down movements marked a small ark on the plug.
Removed brackets, careful measurement of vertical position of non modified hole, transferred to plug gave us the "pin pint" position for drilling the new mounting points. Drilled the 1/4" holes.
Brackets re installed , now a nice close fit.