G'day Widget ,Mf and Tyler,
You could try ODK if you check the dimensions
https://www.outdoorking-forum.com.au/lawn-mo...oodruff-key-no.6-a02051-714-0365-7140365 A new Woodruff Key shouldn't be more than $5 . or try a local bearing shop .
Looks to be a steel key ,on a few occasions if i can't find the exact size key I just file down a slightly larger key until it fits .
The spring goes in the hole in the base but sometimes if the spring has no tension there is another hole in the height adjuster
bar , you just move the spring up to the next hole if the height linkage bar is multi drilled.
Cheers
Max