Its like the con rod bushing is an oilite press fit into the con rod, if its overheated and run dry it may have part welded itself or distorted, esp if its contacted the cylinder wall... May be fixable... but law of diminishing returns might start to apply...
You might find some info here: Air Compressor Parts by Manufacturer - Master Tool Repair

ould also be very similar to the Clarke 250 Pather... http://www.clarkeservice.co.uk/manua...nther25_50.pdf

At least one model on that site lists a conrod as a spare "in case you forgot to oil it and ran it dry"