tap for rolex daytona gen tube mod

[db1]

Hi,

i am looking to buy a tap for use for installing a gen tube in a secs @ 9 daytona (a7750)

im aquiring a gen tube from SpinMaster, and would like to get the correct tap for this installation

The Zigmeister told something about a 3X3.5mm tap (?) but i cant find it on the bay..

where else?

im gonna need this tap with a handle, and a tube inseration tool (or alternative)

any help will be so much appreciated =]

thanks!

db1