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Have you ever been working on your motorcycle/car and figure out you need a special tool for that one nut or bolt? Instead of buying it from the dealership, why not make it yourself?  This Instructable covers making the tool to remove the oil filter nut on the 1976 Honda CB500T.  This may also be the same tool for the other Honda Twins of the 70s.

I made this tool at Techshop SJ.

Step 1: Parts and Tools

To start off you are gonna need a few tools and supplies:
  • 13/16 " spark plug socket
  • Angle grinder
  • Angle grinder Abrasive wheel
  • Dremel tool
  • Dremel grinding stone
  • (Optional) Vertical Mill
  • (Optional) 1/4" Carbide End Mill

Step 2: Getting the Rough Shape

Now you need to take your 13/16" spark plug and get it into the rough shape of the tool. There needs to be four teeth evenly spaced from each other.
Use the angle grinder and abrasive wheel to remove the material in between were the teeth need to be.  Make each tooth to be about 6 mm wide +/- .5 mm.  The teeth should be about 7 mm tall at this point.
This step does not need to be perfect, as I am going to go back and get it to a more precise shape with the dremel tool.

Step 3: Getting More Precise

Now I went through with a dremel tool and the grinding stone to get the shape down to specifications.  The teeth should be 5mm wide by the end of this and about 8mm tall. It is handy if you have the nut with you at this point to test fit it through out. 
Also, the teeth will need to be ground down to be thinner so that inside diameter of the teeth will be slightly bigger. Otherwise, it will not fit properly on the oil filter nut. I took out about half of the material in the thickness of the teeth.

You should now have a tool that fits on the nut, although it may not look real pretty.

Step 4: Getting It Even More Precise (Optional)

This step is optional, as your tool should already work, but you may want it to look and fit slightly better. 

I used a 1/4" carbide end mill, although anything up to about 3/8" should work. I used the mill around the teeth to give them straight edges.

Be careful with your speeds and feeds.  If you get these too far off, you could dull or break your end mill. I used this handy calculator to figure out  mine.

Step 5: Enjoy Your New Tool

You can finally finish that oil change!
You don't need to remove oil filter for oil change, it's just a cup fitted to end of crank. It works by centrifuging dirt out of oil, the more rpm your doing, the better it works <br>It's wise to remove the end cap around 5,000 miles and cut/scrape out the almost solid mass inside filter, forms a layer which is relatively easy to remove, looks a bit like oily cardboard
Same tool is used on CB/CD 175, CB/CL250/350, CB/CL250/360 and the DOHC CB450

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