This archive contains a cartridge image (both .crt and .bin) of an excellent set of diagnostic tools for troubleshooting, aligning and setting the speed of a Commodore 1541 or compatible floppy drive.  The archive was sourced from blog.worldofjani.com. 

The cartridge form of these utilities is really nice because if your drive is hard set to device 8, booting drive alignment utilities can be challening.  Also, exiting a utility and switching to another is almost instant.