Congrats with your "new" KN5000

Probably hard to find a HD nowadays, but try Technote
and / or Keysoft Service to see if there are any left
in stock.
Walt Tenay might be a shoot too....
Good Luck.
GJ
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)