Parts list:

• 1 3/4" Bi Metal Hole Saw
• 1 7/8" Bi Metal Hole Saw
• 2" #8 or #10 Machine Screw
• Nut for above screw.

Build:

1. Put smaller hole saw into larger. It should *just* fit.
2. Work out where to put the screw hole.
3. Use drill punch to make drilling the curved surface easier.
4. CAREFULLY drill straight through the whole thing using a drill press.
5. Insert screw, dab thread lock, screw on nut.
6. Go drill out the access ports.
7. Properly degrease and paint the new bare steel surface you just made!

Notes:

• Appropriate hole saws can be had dirt cheap on Ebay.
• If you have thread lock, use it on the nut.
• Buy hole saws which use the screw in/drive pin type mandrel!
• Deeper sockets are better.
• Drill out the hole saws just large enough to tightly insert/screw in the screw to lessen play.
• While I would have expected appropriate mandrel combination to exist that would allow this combination proper, I was entirely unable to find it.
• The 1 3/4" hole saw acts as guide to enlarge the hole to the 1 7/8" that is required for the spring compressor.
• It worked great for me on my w123 300td, as did the spring compressor

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