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Hey RD, would the Harbor frieght stapler split a thinner floor type with a small tongue, I'm getting ready to lay 1/2" x 5" cherry engineered floor and was going to rent and I had looked at the HF one and thought the 15 gage staple with a 1/2" crown would pulferize the small tongue on my engineered floor, or would it?
I can't be sure; but I can say that you canm do an aweful lot of "adjusting" by changing the air pressure and shimming the shoe plates.
Both the Bostitch and the Harbor Freight tools were splitting tongues on my 5/8" bamboo until I shimmed the plates and turned the pressure down. I ended up using only 60-65 psi. Also, it seems very critical to shim the shoe plates so that the staple is entering right in the angle at the root of the tongue. I actually set mine shooting slightly "high" so that the staple just skims across the chamfered side-edge of the board above the tongue and then is forced to enter just at the "board side" of the root of the tongue.
I shimmed with numerous sheets of thin plastic (.015" thick" and experimented a lot before doing real boards.
After adjustments, the staple head lays just barely below surface at the root of the tongue without splitting the tongue. It is very repeatable after adjustment. It leaves no "bumps" or dimples on the surface either.
Conclusion: Staples hold a LOT better than 8d finish nails !!!!! You can hardly pry the staples out even after ripping the boards away, leaving the staple standing there by itself !!!
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Although I've now seen staplers that are more like nail guns with just a trigger release....
I also have a 15 GA finish nail gun, that I use where the floor nailer is inaccessible and I venture to guess that you could do a whole floor with it. Tongue nailing just requires a good aim, and it also is handy for face-nailing the last row or two.