misc ==> Installing Restrictive Trigger On Senco SNS45 Nailer

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This project was about replacing the automatic trigger on my Senco SNS45XP (similar to SNS45) pneumatic stapler, with a restrictive trigger. SNS45 by default works in automatic mode, sometimes shooting more than one staple at a time. This may be useful for roofing contractors, but since I use it for building crates, it was annoying.

Senco offers a replacement trigger free of charge, due to legal and safety reasons. They sent one to me, but I found the instructions to be rather lacking. This page attemps to go to another extreme and offer a photo tutorial for replacing the original trigger with a restrictive one.

One of the most important troubles that you may to encounter, if you are like me anyway, is that you would be unaware of a spring in the back of the magazine, that pushes magazine cover and forces it to close. It is very easy to lose that spring by accident. Do not lose it and pay utmost attention to it while disassembling. Do not forget to put that spring back. There are two recesses in the back between which the spring operates.

One of the pictures (see annotation) shows where the spring that Senco supplies in the kit, goes.


(Click on the thumbnail images to enlarge)
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Original Gun and replacement trigger -- project starting
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New Restrictive trigger and instruction
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Closeup of SNS45XP
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Screws on rear of magazone removed, slide holding clip shown
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Shows fromt magazine holding screws removed
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Removing trigger. Note that both pins need to be removed
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Trigger group and magazine detached. Note slot to put the spring on the bottom of the gun
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Installing new trigger - Part 1
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Installing new trigger - Part 2
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Do not forget to insert a magazine cover support spring
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Project completed

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