take a look at my post above with picture, do you think i did a proper way on mounting the tranny?

 

i already mounted the transformer before i red your reply, but anyway, take a look at my setup, please refer to the image i uploaded below, the arrows in yellow are tire interior rubber, i shape them and cut, the purple arrow is the metal plate, i will enclose the transformer on a atx power supply casing. should i change the top rubber(behind the metal plate) with the same size on the bottom? any corrections, suggestions, and improvements based on my work? i really appreciate it.

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Now that it has been established that You are
not putting it in a closed-Box, with no Air circulation,
what You have looks just fine.
Just make sure that none of the Windings are in direct contact with the Metal-Box.
It's very easy to rub through the thin insulation of "Magnet-Wire".
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what do you mean rub through the thin wire insulation of magnet wire?

 

I don't understand your question.
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im not so good in english though , yeah i got it, anyway, should the bolt nut be very tight? and is there anymore i can do to prevent flux leakages?

 

If You mount a Circuit-Board directly on top of the Transformer,
you "may" have some noise problems, maybe .....
otherwise, don't worry about Magnetic-Fields from a Toroidal-Transformer.
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If You don't want it to be permanent,
put a piece of Aluminum-Foil on a flat, hard, surface,
and then J-B-Weld the Transformer to the Aluminum-Foil.
After it hardens, tear-off the excess Aluminum-Foil around the edges.

This will help to protect the Transformer-Windings from damage or abrasion,
and will improve Heat-transfer to the Aluminum-Box at the same time.

You can do this to the top-side of the Transformer too,
if You want to add additional protection for the Windings.

If your Transformer routinely runs very Hot,
you can then add a small piece of Aluminum on the top as well,
instead of using the Rubber and Steel Washers that were supplied with the Transformer.
Aluminum transfers Heat much better than Steel.
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hmm when putting jb weld , shoud the transformer bare? or just epoxy the plastic covering to the aluminum foil?

 

To me the more general question is, why do you need an EMI-Filter?
The previous ATX power supply operates with primary side switching, so it has some higher frequency components which should be filtered before entering the power net. Even a 2m supply cord makes a good antenna.
The transformer I see looks like a regular line frequency transformer. Usually you have bridge rectifier and some electrolytic capacitors on the secondary output. Even if you use a switching power supply after it, these parts transformer - rectifier filter capacitor will have some significant RF-signal suppression.
I am right, is it a line-frequency transformer ?

 

im still a beginner and am not familiar with line frequency transformer, but the transformer i have came from an audio amp

 

hmm when putting jb weld ,

I would never go the J-B Weld route. There is a reason the manufacturers use rubber and not one or no one else has ever used J-B weld. You say the transformer came from an amplifier, how was it mounted? Bet there was no J-B weld involved.

And yes, the bolt and nut must be tight.

I guess I'm not doing the right thing with my answers, so here is my take on looking smarter -
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it was mounted with the rubber pad and steel washer, so with the bolt and nut, it was mounted on a wooden speaker

 

it was mounted with the rubber pad and steel washer, so with the bolt and nut, it was mounted on a wooden speaker

Then why not do it in what ever cabinet you use? Your worrying about heat is not a worry at all.
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thank you atleast i have an idea now, by the way,should the ntc thermistor in series withthe fuse? i have seen them in atx power supplies but they are in series with neutral wire and fuse is in live/hot