Why I came here: The nails were falling out of my device (I have the same wireless model), and it didn’t hold them properly right out of the box. My advice: slightly bend the ends of the nails so they create tension when inserted.
The curvy one is called a WAVE staple. The two staples you mentioned that you don't use are inside and outside corner staples. The other one is a flat staple. One trick is to make a slight twist or turn after the staple has been inserted into the plastic which helps lock it in place. Another tip is you can adjust the shape of the wire with needle nose pliers to fit the shape of the plastic, making it more of a curve either concave or convex. Add a piece of metal screen to increase surface area structural strength pushing the staples in place to tack in the screen and then use the flat chisel iron to press the screen into the plastic. I also place the staple against the plastic before heating it up and I cycle the power ON & OFF to just keep it hot enough to melt into the plastic. Too hot and it might melt all the way through and push through to the opposite side. I also take a small flat head screwdriver or a small flat chisel to smooth the soft plastic, while it is still moldable that gets pushed out to the sides, back over the top of the embedded staple. If you have a soldering iron with a wide chisel tip you can also use that to smooth and shape the plastic after the staple has been set in place. If you don't have something like that, there is another tool called a plastic welder which is exactly the same as the soldering iron handle with a couple different chisel like tip accessories. I found mine at H. Freight for around $15 with a coupon. The staples come in two thicknesses, 0.6mm and 0.8mm. I find myself using the smaller of the two, 0.6mm, more often than the larger 0.8mm staples. I have the exact same hot staple gun, I kept the wire cutter. I recommend if you purchase the hot staple gun, order a package of extra staples. Usually, the assortment includes all the different styles in 1000 pcs in your choice of either 0.8 mm or 0.6 mm. Get a pack of each size, I suggest getting 2000 pack of the 0.6 mm since you'll find using them more often for the thinner plastics.
You are putting first staple in a wrong direction. If you put them in the other way ("vertically") then these would not be able to stretch on crack. Documentation diagram "A" shows correct orientation.
put the staple in place and ready...then pull the trigger. you have way more control of the depth doing it that way. I use mine all the time. it was bought for a one time job and also figured that was about all i would get from it....I was wrong! this thing just works!!
It's is best to hold the wire tightly with needlenose or pliers and then cut the wire close to the surface, never hold the wire with your fingers or when you snip it off the energy released will drive the wire into your fingers. Trust me on this, I am speaking from painful experience and used those same needlenose pliers to pull it out of the tip of my index finger! And if you don't hold the wire and just snip it off, it flies off and could end up in your eye or you will find it later embedded in your foot or clothing or your dog's paw if they might step on it. Dispose of those wire clippings in thre trash can. I use a magnetic parts holder to hold the snippings dropping them from the needlenose pliers after I clipped them off. Make the touchup finishing like smoothing the plastic that gets pushed out and on the sides of the openings with a hot solder iron and flat tip.
bought one too-very useful- still have and use wire cutter item came with.I don't wait for metal wires to get red -literally seconds after holding trigger wire gets hot enough to melt into plastic being mended .
There is another kind of plastic welder that has a welding tip. You can use that with paper clips. No need to have multiple tools when you can use a tool multiple ways.
Advice on running cracks. Drilling a small hole at the very end of the crack will stop the stress that causes the crack to continue to run. Then you can remove some material from an inconspicuous area and fill in the hole you drilled by melting it into the hole.
You can make plastic paste by combing acetone with so plastics. Acetone and ABS plastic works, like from a 3d printer or even acetone and LEGO, which comes in many colors which is helpfull
