This instructions is based on  https://www.instructables.com/id/Binocular-Lens-Cap-Tether/?ALLSTEPS that i find very useful. Thank you very much for inspiring me number8wire. For me an old  Telephone Extension Cord whithout use was more handy than an inner tube. and in the end it turned  to be less bulky too. 

Step 1: What Do You Need

1) Telephone Extension Cord
2) Super Glue
3) Scissor
4) Lens caps 

Step 2: Measure,cut and Pass

Measure  and cut the cord according the extension that you desire.  Glue  it along the front lens cap as you can see in the pictures. The telephone  extension cord fits well because it is flat .  

Pass the other cord  end trough the space between  the focus wheel and the ocular, attaching  it to the eye lens cap. I made  a knot and glued . That is it, i hope this instructions can be useful . 

Here, my inspiring instructable https://www.instructables.com/id/Binocular-Lens-Cap-Tether/

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