I picked this up at auction today. Ideal I thought for metal fettling. Has one jaw missing but is in reasonable nick. Its a Sealey ASV250. 250mm jaws and opens 250mm I would like to get the nut out but I am wondering how to get the pin out as it is a blind hole. They don't make them anymore but you can still buy them new on the net. You can get a few spares but the jaws are £70 plus each. About three times what I paid for it! Are they just mild steel or are they hardened?