Nice bodge Sly Fox !
Sometimes in situations like that you can use a Jubillee Clip [ hose clamp] on the shaft to prevent the sprocket moving .
Old farm machinery used to have wooden blocks as chain tensioners and guides , very crude but you can also use wood as a bodge sometimes ,oil it well though .
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Blessed are the cracked, for they let in the light. - Spike Milligan
"When you come to a fork in the road ,take it ! When you come to a spoon in the road ,take that also ."
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