I haven't found the pin trick in any Mitsu manuals for a DSM, but it's there for a 3S.
According to the manual the standard value for the rod protrusion (on both a 3S and DSM) is 3.8mm-4.5mm (.150-.177 in.). I usually use a drill bit on the dsm to measure this. On the 3S I do the pin trick. When I changed the timing belt a couple weeks ago on the stealth after 70,000 miles I was still able to put the pin in the old tensioner before I removed it. I was pretty happy about that.
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