Well what was said in the title, a mod for the joycon with a piece of silver paper 100% effective.
Step 1: Unmount the joycon and remove the pad (without breaking it).

Spoiler

Step 2: Under the pad are these pins, we have to join the marked in the image, for it we cut a piece of silver paper.

Spoiler

Step 3: We place the silver paper making contact between the two pins and place the pad on top.

Spoiler

Step 4: We check that the joycon works correctly before closing it (IMPORTANT to check first that it works in the system, if the bridge is done wrong, the console may not recognize the joycon).

Spoiler

If everything works well you just have to close the command and go.

 

[itsjch]

Works well I just done it, but it was so painful getting the foil lined up..

 

[BlastedGuy9905]

I did it! It works amazingly and the Switch still detects my Joy-Con, thanks so much!

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Works well I just done it, but it was so painful getting the foil lined up..

I did it by sticking the foil on the pad and adjusting the pad instead.

 

[Newedge_Isaiah]

It seems like it works for a few times, but then it just stops. No idea why. I opened the Joy-con up and looked with a flash light to see the foil still over the pins, and when taking the pad off SLOWLY I could still see the foil was on top of the pins. Any idea why it stops working sometimes?

 

[jimmyj]

would adding tape to ensure that the foil doesn't move be safe?

 

[Canna]

Well what was said in the title, a mod for the joycon with a piece of silver paper 100% effective.
Step 1: Unmount the joycon and remove the pad (without breaking it).

Spoiler

Step 2: Under the pad are these pins, we have to join the marked in the image, for it we cut a piece of silver paper.

Spoiler

Step 3: We place the silver paper making contact between the two pins and place the pad on top.

Spoiler

Step 4: We check that the joycon works correctly before closing it (IMPORTANT to check first that it works in the system, if the bridge is done wrong, the console may not recognize the joycon).

Spoiler

If everything works well you just have to close the command and go.

I sure as sh*t do not recommend this The Guide

is nice too look at and the information on how to do it is great.

But soon as you knock drop or displace that piece of tinfoil your fckd..

If that bridges with pin 4 or 8 i forget the exact pin it will brick you

Buy a jig, make a jig, or
atleast solder a button connection or a magnetic switch in joycon

 

[BlastedGuy9905]

would adding tape to ensure that the foil doesn't move be safe?

The foam-y sticker pad thing in the joycon is what you use to stick the tinfoil down...

 

[electronrancher]

I read it as gum wrapper and thought, that's really clever!

 

[jimmyj]

so uhm my replacement rail didn't come with the foam,can I use tape to keep it in place?