Like the title says. my whole pulley and hub, (guess u would call it) are loose. there is a center hole empty. is it just bolted on? If so what size, thread, and length bolt is it if anyone would be a gent and remove theirs? If thats not the case, is it a retaining pin or something internal? This is an OM603 by the way. thank you for any help in advance

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Lotus 7 replica-20valve 4AGE
06' 500R Ninja Naked/Café/Custom
86' 300 SDL (Donor)
98' Discovery 50th anniversary (Recipient of transplant)