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- Feb 1, 2015
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The screw in my 13 mm Albrecht ia an M4-.7mm x 14mm thread length. It has approximately 6mm of thread engagement. It is not a cheesehead as it has a chamfer on the bottom of the head. The tap drill size would be 3.3mm. If drilling out the old screw, I would use a drill slightly small to avoid damaging the threads. I would drill from the thread end of the screw. My Albrecht's have a fairly small exit hole and you would have a much better chance of centering the drill on the screw. If you slice through the screw, you will still have to drill the old remnant out to salvage the collar.
With a careful setup, you should be able to successfully remove the old screw. If you don't have an OEM replacement screw, one could be made by turning down an ordinary flat head screw. Here is a fairly close approximation of what you need.
With a careful setup, you should be able to successfully remove the old screw. If you don't have an OEM replacement screw, one could be made by turning down an ordinary flat head screw. Here is a fairly close approximation of what you need.