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Step 6Home stretch
At this point the "Instructables mist" may descend as you realise the end of the project, like the bottom of the ice cream tub, is in sight, and power through to the end without properly documenting your progress.
Insert the tube without any plastic bits in it (hereafter the "barrel") into the bottle from the neck end, with the non-broken end downwards. Push it most of the way through the hole until about 10cm (4") is inside the bottle. If the barrel is not quite straight, don't worry. If the barrel is not at all straight, as mine turned out, you can soften the plastic around the barrel seal by wafting a lighter flame at it and straighten the barrel out. If you happen to have a hot glue gun, run a bead of hot glue around the seal once you are satisfied with its straightness. If not, get creative with the duct tape to find the best way of making it conform to a cylindrical 90 degree join.
Cover the sharp pointy end of the other tube with some suitable covering to prevent injury on it. Do not underestimate the power of torn metal edges- I stabbed myself in the finger with the Marksman in the picture and didn't bleed, then promptly cut myself open on half a mop handle.
Duct tape the non-barrel tube (hereafter the "barrel support") to the bottle (hereafter "combustion chamber" unless I get bored with typing that) pointing parallel to the barrel. Resist the temptation to try to get everything perfectly straight at this point- tuberous projectile ballistics is not an exact science.
Find your junk box. Take your junk out of the box. Find some sort of rigid support from your plastic junk to attach between the barrel and barrel support. I used a bracket from a bike pump that didn't fit onto my bike, as it already clipped onto the barrel support and merely needed taping to the barrel.
Insert the tube without any plastic bits in it (hereafter the "barrel") into the bottle from the neck end, with the non-broken end downwards. Push it most of the way through the hole until about 10cm (4") is inside the bottle. If the barrel is not quite straight, don't worry. If the barrel is not at all straight, as mine turned out, you can soften the plastic around the barrel seal by wafting a lighter flame at it and straighten the barrel out. If you happen to have a hot glue gun, run a bead of hot glue around the seal once you are satisfied with its straightness. If not, get creative with the duct tape to find the best way of making it conform to a cylindrical 90 degree join.
Cover the sharp pointy end of the other tube with some suitable covering to prevent injury on it. Do not underestimate the power of torn metal edges- I stabbed myself in the finger with the Marksman in the picture and didn't bleed, then promptly cut myself open on half a mop handle.
Duct tape the non-barrel tube (hereafter the "barrel support") to the bottle (hereafter "combustion chamber" unless I get bored with typing that) pointing parallel to the barrel. Resist the temptation to try to get everything perfectly straight at this point- tuberous projectile ballistics is not an exact science.
Find your junk box. Take your junk out of the box. Find some sort of rigid support from your plastic junk to attach between the barrel and barrel support. I used a bracket from a bike pump that didn't fit onto my bike, as it already clipped onto the barrel support and merely needed taping to the barrel.
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