STC web: https://www.stcitalia.net/english/products.html
I suppose it might be similar to Tomba on this image..?
forums.deeperblue.com
I suppose it might be similar to Tomba on this image..?
Tomba - All in One barrel sealing
Pushing the "O" ring into place is the problem with these last two designs, although capping the "O" ring inside the closed up line slide is a nice idea once the shaft flies to the target. A soft split partial cylinder that could be interposed for loading and which could be pulled off the shaft...
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