Unilateral pediatric hand weakness is caused by neuromuscular disorders such as Cerebral Palsy, Muscular Dystrophy, and peripheral nerve damage. Patients with unilateral hand weakness need to use aids to complete everyday tasks like dressing and holding a pencil, creating a dependency that is psychologically damaging to young children who cannot have peer interactions that so developmentally integral. While there is a multitude of existing aids, they are all generally sized for adult hands, can only be used for one specific task, or are very expensive. A fully mechanical modular-attachment assistive device was ideated, assessed by various criteria, including a finite element analysis, and designed to be safe, simple, versatile, adjustable, and cleanable.