I looked at this tool on the RCBS website, there was no explanation on how the primer insertion depth is adjusted. The RCBS RAM-PRIME that I use is easy to adjust by screwing the device up or down and setting the locknut like you do with a typical set of reloading dies. On the Hand-Primer I see that when the handle is all the way in the primers are set to a certain depth. But is that point adjustable?