I have been using handles from detergent, dishwasher soap and other types of bottles for over 20 years to make materials easier to grasp and use. The following videos demonstrates how to make it easier to perform insertion tasks, use a ring stack and sponge painting.
These ideas are described in my book THE RECYCLING OCCUPATIONAL THERAPIST. END OF YEAR SALE
My book sells on Amazon for $35.00, but you buy it through pay pal, here for only $25.00 until the end of the year.