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You could use a canvas drop cloth for the sail.
My husband worked in a forge room where they made commercial tools like crowbars. He says that the owner bought rail steel once to save money. It turned out to be unworkable for making tools because of it's properties. When a train is going over a track it needs a rough surface to catch the first wheel. It then heats up with contact with that wheel and becomes smooth so that the rest of the wheels can glide over it, but then after it cools it goes back to being rough so that the first wheel of the next train can grab it. This is not what you want steel to do when you are making tools. Did you have this sort of trouble with it.
back in the early 60's there were no plastic straws they were all made of paper.
Why not glue them with wax? Apply the wax in the forming stage, step 3, instead of glue. It might take a special type of wax. I worked in Paste up for printing and we used a wax glue but that wax made the pasted things removable and you would need a harder wax than that so that the straw would be stiff. I don't know if paraffin would work as glue or not but if not there may be a type of wax that does. If you use the wax as glue then you don't have to dip them.
farna I used to have my kids do the same thing, the WWII planes came from a book that showed blueprint type diagrams of actual planes and by tracing them and using the paperclips where the engines were the planes flew really well.
trace blueprint type diagrams of actual planes and put you weight coin or paper clip in the location of the engines and the plane will fly really well.
I have considered a Sudoku quilt. 9 colors. squares arranged according to a completed Sudoku puzzle.
I had thought about a game like this but I didn't think of Lego pieces, good idea.
These exercises give the fingering for pairs of notes. It may help in playing hymns.
Can you do it with just one bag?
For #2. Tape plastic bottles together to make a boat.
Deodorize puke buckets, after I empty such a bucket, I wash it and spray it with H2O to sanitize and then I rinse it with mouth wash so the patient has a nice smelling bucket.