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Bolts for new style pull start post (MP046k) Old style post can be modified to accept the new bolt if you have basic metal work skills. Failing that you can purchase the complete kit MP046k
https://www.skyboundaviation.uk/products/mp046k-kit-aluminium-spacer-orange-with-dedicated-bolt-6-x-63-mm-set-of-4?_pos=1&_sid=c1c6200c0&_ss=r