For those who may want do their own servicing and wish to change the spark plug, here is what you need. If the wiper arms are seized on to the spindle, a puller/removal tool will be needed. I got mine from Machine Mart: https://www.machinemart.co.uk/shop/product/details/cht436-battery-terminal-bearing-puller The price was about the same as online and it can do varied jobs. Then you need a suitable socket of the correct size. Thank to "I", I got the correct socket which is a Laser 8mm 3/8 14mm
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