If it's any help, the old Masport Olympics ( which is the son of the Morrison which is identical to the imperial) had a left hand thread on some sprockets

Portal Box 6

Entire Thread
Subject	Posted By	Posted
1972 Victa Imperial Reel Mower	Dugg_Bobcat	07/02/23 01:38 PM
Re: 1972 Victa Imperial Reel Mower	NormK	07/02/23 11:37 PM
Re: 1972 Victa Imperial Reel Mower	Dugg_Bobcat	09/02/23 01:29 AM
Re: 1972 Victa Imperial Reel Mower	Tyler	09/02/23 02:04 PM

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