Best tool to use is a shortish tapered drift that can't fall completely down the hole or damage threads. Work it gently around to align stays and kingpin then carefully remove and engage threads of oiler bolt by hand, not forgetting washer(s) underneath. Only when sure of engagement tighten with spanner.
You may need a few attempts. In typical sods law fashion it took a while to get one side in but other engaged on first attempt
If you have later car with round ended kingpins and adjustable camber plate, assemble the split washers with plenty of grease and tapers facing each other. They should then settle into natural position immediately under oiler bolt as it's tightened.
