Question About Retapping

[manuel]

Hi!

We all know that changing the tube and crown is a must to do.

I have a couple of questions wich i´d like to know, so thanks in advance and hope this post helps another member.

In a post of this repair section a member asked if he would replace the crown, Tribal comes in and says this:

the TW-case has a tubehole diameter of 2,5mm.

You must drill out to 2,8mm and than retap the hole...

The Tap has a Diameter of 3mm x 0,25mm pitch..

After reading this, I wonder that a drilling machine should be used. Then what is the good size to start with?

Can we start directly with a drill of 2.8mm?

After drilling the tubehole, Do I have to use a Rolex tap for 6.0MM Tubes like the pictured below?

How do I use it?

After retapping, then comes the new tube placement, How does this thing works?

What if I have an old style case with a 5.3 mm tube installed and I am planning to put a 6mm tube?

Is the hole of this case too little to perform these operations or its just fine?

Thanks a lot and Regards,

Manuel