Redtail,
I appreciate your predicament. I recently had one of these lazy useless clods foisted upon me. I did not know of this person's reputation at the time, but rapidly became aware of his utter uselessness. Cannot even read an IPC, yet is licensed for many years. They do still get through the cracks, everywhere.
There was little the management wanted to do, and as I had no say in his employment initially, I could do nothing but point out the danger he represented to the operation, to the Manager responsible.
Now some time afterwards, I have yet to find anyone who has ever worked with him that has anything good to say about him. Yet, he still manages to pull the wool over management's eyes and get the occasional job.
I appreciate your situation, and can tell you there is little you can do. I actually delayed the aircraft if he did not carry out the work properly (I was on the following shift), and did it properly myself. At least my conscience was then clear.
Be patient, it eventually comes to them that they deserve, while the rest of us keep the aircraft safe.
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When all else fails, read the manual!