I've been in the electronics industry for over 50 years. This is the first time I've had a bunch of non-working fuse holders. When the first one didn't work, I initially thought it was a blown fuse. Then I thought I made a mistake with the wiring. Upon examination, I recalled that the fuse was very tight when inserted into the cap. When screwing in, I noticed that the screw tension was very tight. Unusual, I thought. It turned out that the copper fuse cap retainer was entirely dependent on the fuse itself, forcing the copper to press against the brass threaded portion of the cap. It failed completely. The stream NEVER flowed. As you can see in the photo the solution was to solder the copper part to the brass cap. This had to be done so that the fuse would still fit. In addition to the original I used to troubleshoot, I have now returned the remaining nine items for a refund. I have now ordered other fuse holders from an alternative source. I never want to see those awful little things again.
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