Anyone know where I can get a replacement voltage adjustment screw for one of these?  I was messing with the one unit that has given me troubles and broke it.  Not sure what I did but was having troubles with adjusting it so I grabbed a needle nose and well broke it.  I am comfortable soldering a new one on or looking for someone local to do it.  I just need to purchase a new one and I have no idea how to look it up.

Thanks