I have a desk made with 2x4 legs I want to increase the height for a work table. I'm thinking adding 5 1/2". How to I connect the new piece onto the original leg? I've been looking at pocket holes but didn't know if this would be strong with the wood grain.
It would be helpful if you could add a picture of your desk to your question. The commenters are correct. A work table with 2x4 legs is probably not fancy, and doesn't need a fancy job to raise it. If it were my project, I would either replace the legs with longer ones, or add a 5-1/2" stub under the leg while scabbing a full length 2x4 leg to the inside of the original leg. Use 2-1/2 inch screws and horizontally screw the new leg into both the old leg and the stub. You can optionally toe screw from the original leg into the stub - just like a pocket hole, but less of a process.