Helper grip for bicycle

To see my nephew cycling, I thought about how difficult it can be for a child or an adult do the same.  For that reason was made the model B, it has a slightly big design, but it was necessary to have a support to hold on, a guard for fingers and a base where it can support and resting your wrists. Printing at least 80% full and use filament ABS, Nylon or XT. The design can be scaled to convenience  I hope  this design be helpful for those with limited use of their hands.