New and reconditioned cylinder heads are available from the manufacturer and engine reconditioning specialists, with some specialist tools required for dismantling and inspection, making it more practical and economical for home mechanics to purchase a reconditioned head instead of dismantling and inspecting the original. To remove the cylinder head, start with the appropriate procedures for 1.2 litre petrol engines, 1.6 litre petrol engines, or diesel engines. Next, remove any remaining ancillary components from the cylinder head as necessary. Using a valve spring compressor, compress each valve spring until the split collets can be removed, then release the compressor and lift off the spring retainer, spring, and spring seat. If the spring retainer does not free easily, gently tap the top of the tool with a light hammer. Withdraw the valve through the combustion chamber, ensuring that each valve is stored with its collets, retainer, spring, and spring seat in the correct sequence. If valves are to be reused, place each assembly in a labelled polythene bag or similar container, noting that No 1 cylinder is nearest to the timing chain end of the engine for petrol engines and nearest to the flywheel end for diesel engines.