Picker-upper joint supports

I am disabled and the use of a picker-upper is a necessity. However, I have found that the folding joint/locking mechanism is prone to break.I based this model on picker-uppers available at Walmart but the joint/locking mechanism do vary slightly in size, so the model may need to be adjusted. Please be kind as I am new to 3d printing and this is the first model that I have made.