Be glad you don't have one of the non-selective triggers that Ithaca used on the NIDs. It is a Rube Goldberg device and made of stamped parts.
Jim
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Rube Goldberg!

They work just fine until like most ST's, someones fixes them. The one pictured isn't exactly a hand sculpted work of art in itself but they all seem to get the job done if installed and adjusted correctly in a properly set stock as already pointed out. The SNS triggers I've had on 3 NID's all worked fine including one basket case 16ga grade 3E that I restored. It's really quite a simple device working off the right hammer follow through to allow the left sear to be fired. I must agree with you the selector indicator markings on the gun in question here could have been done up a bit more 'from the factory' looking than they did. But there's no argueing that the Miller or Ithaca/Miller triggers worked well no matter how we view the cosmetics of the installation.