AD tells us that the "Bulge" in the fuse is good...Allows some flection of the
metal without breaking under the heavy Amp/Heat loads it carries.
If you were to tighten down the two fixing screws with the Fuse "Flat and Tight"
there would be no flection room and the Fuse's lifespan would be shortened.

An Unsolicited Recommendation:
Using "Ether", "Starting Fluid" , Etc. WILL BURN OUT GLOW PLUGS!
It also is not healthy for your "Loaded","Driven" engine components.
(Look up the Energy Release Coefficient Differences of "Ether" and Diesel)

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'84 300SD sold
124.128