The block wasn't interchangeable. The block was part of the gauge. The handle part will (?) come out/away but that's simply a means of inserting the gauge into the rifle body. When it's in the body, you use the part 2 of the gauge, the SM 387 part.
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The block wasn't interchangeable. The block was part of the gauge. The handle part will (?) come out/away but that's simply a means of inserting the gauge into the rifle body. When it's in the body, you use the part 2 of the gauge, the SM 387 part.