Radionic devices was build with two wells, one for the witness and one for the trend, or with multiple wells (typically used in agriculture), or with single wells.
The single well design is used in most cases for creating homeopathic remedies, with other words as output only device.
There is a possibility that we can use it for both, the target and the source. This is possible because a software can record the signature of the witness. After that it can be removed from the well and a carrier material like globulis can be placed in the single well.