I'm not sure if this qualifies as a safety item, but it certainly is an oddball. Had an RV in our shop for an unrelated issue that required cowl removal, which led to us having a look around, and we spotted this. The builder (not the owner of the airplane) had installed an ANL current limiter base in the B lead circuit for the alternator, but rather than spend the princely sum of $15 or so for a proper current limiter, the gadget in the photos below was assembled from a combo of a blade fuse and some brass sheet. Arguably the slow blow fuse shown in the photos has similar, though not identical properties to the current limiter that would fit in the base, but still. Cheapskate or ...?