I now someone here used a bandsaw to cut them down but that's not something that I have access to. Can it be done with ordinary handtools? Anyone know if they really are magnesium or if they are some kind of alloy? Good to know since you have to cool down magnesium when cutting it. I'm just considering what to do about them since they seems a little bit too big to just leave them as they are and changing to PVC insert might be more work than cutting the existing runflats. Any suggestions?