Will there be any 'Arrow' mark in a Fuse holder?

Absolutely, if you're going to do something, best to do it right.
My electrician told me that food from the fridge will taste better if that cryoed, polarized romex is used to power the fridge! Soon I'll be able to enjoy harmonically rich food while listening to my more tasty hi-fi, or was it tasty food with harmonically rich hi-fi, I forget what he said exactly.

'anyone recommend a good sheet-rock repair person?

Rhapsodi, I don't think their is any convention. Most the holder is just two sets of clips.

Take the fuse out and use a meter with one lead on one of the clips and the other on one of the ac IEC blades. You want to identify the clip with the least resistance to the blade. The arrow of the directional fuse should go from that clip to the other.

Sebrof, I certainly don't try everything that people come with, but this was so easy. Incidentally, many were strongly suggesting using copper tubing over the chassis IEC plug. There was even a video showing its effectiveness. I tried it and found it worthless. I guess it would depend on how well ones power cords are designed and made.

Most manufacturers do not put an arrow on the fuse holder because the polarity of the sine wave coming out of the wall socket depends on (1) whether you are above or below the equator and (2) the position of the planets at the time that you change the fuse. For example, when Saturn is in quadrature with Mars, the fuse should point toward the component but the reverse is true when in Uranus. These facts must be considered or you would only be guessing at the polarity of the sine wave coming out of the wall. Then there is chaos theory which can only be dealt with via control theory and of course the principle points of interest there are at 86 and 99 Hz, with the first being most important and often referred to as the MAXWELL equation SMART point. Audiophilology is extremely complex, much more than anything that NASA ever deals with. Hope this helps.

I searched long and hard for the source of the quote in the original post and finally found it. It is on page 963 of THE FENG SHUI OF FUSE HOLDERS by Hugh G. Lyar [sec. ed.]. Seriously, I have known audiophiles to obsess over fuses; a friend substitutes MAGNETS for his fuses, others use lengths of exotic wire. Of course these give no protection but that is life on the cutting edge. I defected to the blunt side years ago myself.

Stanwal, I had a guy send me the magnets to try. I did and heard no benefit. I assume you tried changing directions before you went over to the blunt side?