After my hybrid 700c rear wheel rim split I have a replacement coming (thanks Wiggle: free shipping to Spain!) I decided to get the hyperglide cassette off in anticipation. I have the lock ring tool, a good chain whip and a hefty adjustable spanner but the cassette is stuck fast. I have squirted a little oil in the orifices and will leave overnight but I'd be grateful for any tips to help the job along. I don't have access to a workshop.