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Collection, Preservation and Display of Old Lawn Mowers

Ajax Mk3 Gear Case Thread Sizes

Hi lawnmowers. Wanting to relieve and backlap my mk3 ajax, I had to drill out one thoroughly seized screw to get the side gear case off. What size and thread screw do I need to replace it and is there a current source or do I need to find old or used stock?

Many thanks.