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- Mar 20, 2009
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I'm in the process of rebuilding my PML Callisto which suffered a lawn dart due to too little ejection charge to shear the shear pins. In the process of reworking the salvageable components, I note that if the shear pins function as intended, they are a pain to remove from the coupler/nosecone.
I installed 2-56 nylon screws with a clearance hole in the the body tube and a tapped hole in the coupler and/or nosecone, depending on the location. When they do shear, they are left in the tapped hole with no head anymore. In the end, I stuck the tip of a sharp Xacto knife and just spun them the rest of the way in. It really wasn't that bad, but I could see over time that this has a pretty good chance for damage.
When you install nylon screws for shear pins, do you tap the coupler and leave a clearance hole in the BT or tap the BT and leave clearance in the coupler?
Other options or suggestions for easy extraction are welcome.
Thanks,
Sandy.
I installed 2-56 nylon screws with a clearance hole in the the body tube and a tapped hole in the coupler and/or nosecone, depending on the location. When they do shear, they are left in the tapped hole with no head anymore. In the end, I stuck the tip of a sharp Xacto knife and just spun them the rest of the way in. It really wasn't that bad, but I could see over time that this has a pretty good chance for damage.
When you install nylon screws for shear pins, do you tap the coupler and leave a clearance hole in the BT or tap the BT and leave clearance in the coupler?
Other options or suggestions for easy extraction are welcome.
Thanks,
Sandy.