Once the can opener clamped down it is hard to keep it there when your other hand is needed for twisting so the can opener will rotate.
Difficult keeping the meat in place. If it were a meat tougher than a hot dog like a steak or pork, it would be nearly impossible. There needs to be a utensil to keep the meat in place.
Difficult balancing circular shaped vegetable (onion). With only one hand in use, it was impossible to stabilize the onion.
It was almost impossible to open the jar on a flat surface. I found it easiest to either put it into between your legs or under your arm and open it that way
Difficulty stabilizing pan and the weight of the pan was more than expected. Make sure you don’t add too much weight to the pan and do you best to center items
Was difficult to keep shell out of the yolk after cracking. Felt as if the egg exploded in my hand. Try to crack the egg clean and split open carefully
Washing dishes made the process of applying soap to a sponge much more lengthy since I had to lay the sponge down in order to do it. Also, it was hard to stabilize the dish while scrubbing, and made it impossible to scrub hard
There was major difficulty drying dishes due to not being able to stabilize the plate. Since the plate wasn’t stable as I was wiping, I couldn’t wipe the dish off efficiently or well.
Grinders made for a big challenge since the twisting motion is nearly impossible to do with one hand. Even when I managed to get pepper out, it went everywhere since it was so hard to handle
Without the use of a second hand, stabilizing the bowl when mixing more dense ingredients was much more difficult. The bowl slid across the counter top as I tried to mix causing wasted time and energy. Using a glass or metal bowl could cause damage to counter surfaces and could even cause the the bowl to tip over if mixing dough. The more ingredients, the tougher it gets to make a consistent mix with one hand. An automated mixer is a possible solution but requires much more cleaning and would only be viable on bigger projects. A hand mixer or whisk could help but would not be able to anchor the bowl down to mix thick ingredients.
https://youtu.be/0ycHy9Bx7MY
I practiced pouring drinks with one hand into a plastic and glass cup. I found that using lighter cups that weren’t as stable tends to cause difficulty in pouring and potential tipping. This could cause spills but using a heavier cup (glass) was safe and easy to do. There was an issue with spilling that usually happened right as the user goes to pour out of the pitcher and before they can correct themselves in order to keep the liquid from spilling on the counter. I could see that over time a user would get better and better at pouring with one hand and would not need much assistance.
Using ketchup and hot sauce was a medium level task. I practiced using a plate with lines drawn to track accuracy and found that it only takes one hand to use condiments but controlling quantity takes practice. The condiments were fairly easy to open with one hand but could become stuck and cause a one-handed user to exert more energy to open. Trying to draw in a straight line, simulating a hot dog or sandwich, was very easy. Although it is easy to be accurate when squeezing, using a single hand to moderate pressure of squeezes caused a varying level in thickness of botch ketchup and mayonnaise. The line got better over time but I was not able to draw a solid straight line like is possible with two hands. Closing each condiment was simple with the assistance of a flat surface.
Measuring out the amount of spaghetti you wanted was tough unless you wanted the whole pack. Filling the pot full of water and setting on stove was easy, while cooking the pasta seemed very doable.
Making cereal was quite easy to do with very little struggle that is needed to do so. One of the simpler tasks that can be done with one arm.
Making a sandwich was a very difficult task whether it be getting the bread out of the plastic or grabbing the cheese/meat from the container. Taking your time is key for this task.