I want to be able to build or find a mechanical device that can apply very low force/pressure to a material. I have considered using a stepping motor with a flat needle tip but I cant think of a way to make this delicate enough to not destroy my sample. I am wanting to apply forces in the range of milli to micro newtons. I know that this can be done with nanoindentation machinery but I want something smaller/semi-portable that can apply a force and doesn't need to do anything else. Any tips would be appreciated.