One method I have tried, on the pin ashort threaded bit just under the head, the rest root dia, the clevis, head side tapped, the other hole root dia. The thread made a fairly tight fit. Another way I tried, both holes same size, pin with a thread on the end of reduced size, the nut tightens up to the shoulder, there is a couple of those on the Stuart Turner S9 that I rebuilt earlier in the year. Ian S C