I shimmed the sprocket on a bb36 snowthrower too. There is only one tensioner bolt on these but it lined up with the side sprocket. This one has trouble on the lower end where the half-shaft connects to the gearbox, the setscrew keeps working loose and then the joint slips on the shaft to touch the bearing. But, anyway thought I'd post the shim picture.
DSC04466 (400x266).jpg
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Steven
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127 NF, spring assist, 36" IH Danco BB-36 snowthrower, 42" mower deck. CW-36 snowthrower, 42" NF blade. QA42A blower, 126,127,149,1720.
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