Side Panel Handles

I'm trying to free up the handles on an old pair of side panels but they're stuck fast!
So far I've tried Plus gas, acf 50 & let them soak for a couple of days but no joy. used an adjustable spanner to get more leverage but solid and if i use too much force then they will buckle obviously.
Any help greatly appreciated
So far I've tried Plus gas, acf 50 & let them soak for a couple of days but no joy. used an adjustable spanner to get more leverage but solid and if i use too much force then they will buckle obviously.
Any help greatly appreciated
