valve spring compressor
video of cylinder head repair
Undo the 2 rocker arm bolts with the special tool and strip the shaft, keeping all the parts in order.
Refit the shaft and the 2 bolts and you can now use the spring compressor easily.
You may need a small magnet to help withdraw the 2 collets.
Video showing how to use the correct tools to overhaul a cylinder head. Includes the adjustable cylinder head stand, the socket to remove the rocker shaft setscrew, the spring compressor and the valve stem seal insertion tool,etc.