We received this tip from one of our customers and thought we would pass it on. It can also be applied to other AZL's locos like the SD70ACE series and GP30s. - Rob
When recently taking apart an AZL KCS Z GP38-2 to clean, I noticed that you the wipers can fall out easily when the locomotive is disassmbled, They are not easy to get back in place or hold in place when putting the locomotive back together.
So, here’s a tip for your Z-scale do-it-yourselfers. Insert the alloy wipers from one end of each half of half of the molded frame into the grooves until in place. Then, take white glue, like Elmer’s, and spread a thin film into the grooves. Repeat for the other half. Let dry overnight then reassemble. Works like a charm. Be careful not to gunk up the grooves or wipers with too much glue, or I fear you may have trouble with electrical contact.