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Your tappet plate looks like it is worn and cracking or has been glued just above the trigger assembly, also looks like it has some wear at the tail where it meets the sector gear. From the looks of it when I zoom on the images. Also that spring looks stock as well as everything else.
The real question you have to answer here are these.
1. When you fire the mechbox does the nozzel move back and forth at all?
2. What exactly do you mean by "Does not always come back."?
The first is the likely issue, tappet plates wear out like anything else. However, the second may be the piston, pin up a picture of the piston itself, or at least look for wear on the first few teeth. The First one should be metal, if that one has excessive wear on it; then that could cause "Not always come back."
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"The hydrogen economy car from the people who brought you the ' Hindenburg'" - Glen Foster
Condoms do not guarantee safe sex any more. A friend of mine wore one and was shot by the woman's husband!
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