Super-Amazing Thread Finder Tool
I wish I had known about this when I started my restoration. It's invaluable for instantly finding out the thread and pitch of any Standard or Metric size bolt OR nut. Standard is silver, black is Metric. Threaded sections are made from high quality steel and will last a life time. Will pay for itself in no time.
Great for the Jensen, since the engine is metric and everything else is standard. You can hang it around the garage or on yourself when your not using it.