Get a 6mm socket head cap screw that's about 2" in length. Get a nut to thread onto the screw. Get a stack of washers that has the ID of the washer larger than the OD of the pin. Stack the washers on the screw beneath the nut.

Thread the screw into the pin (with nut and washers beneath the head).

Hold the head of the screw with an allen wrench and tighten the nut down onto the washers. Keep tightening and the nut will pull the pin out of the head and into the ID of the washers.

You might find a socket that can also take the place of the washers.