I used to think it sucked that Rain Bird sold their wiper seals for more than the cost of an 1804, because I'would rarely change more than the seal when they wore out. In my own yard I looked at a few 1806s with seals that were almost gone. Used to think that with 1806s and 1812s that the wiper seal swap was a good, relatively inexpensive fix. But then I took a closer look at the pistons and realized that (and in situations with sandy or gravelly soil especially) they were pretty scratched up. The last couple of seasons I've usually been switching out everything but the case. Now I just need a helpful suggestion on what to do with all those spare new cases. Art project ideas?