This was way more work than I intended it to be, but after a lot of searching, and reading... There isn''t a depth restriction:
http://usbcongress.http.internapcdn.net/usbcongress/bowl/equipandspecs/pdfs/04_2009_EquipSpecsManual_WEB.pdf"Holes:
The following limitations shall govern the drilling of
holes in the ball:
1. Holes or indentations for gripping purposes shall not
exceed five (5) and shall be limited to one for each
finger and one for the thumb, all for the same hand.
The player is not required to use all the holes in any
specific delivery, but they must be able to demonstrate,
with the same hand, that each hole can be used
simultaneously for gripping purposes. Any hole that
cannot be reasonably shown to be used with a single
hand would be classified as a balance hole.
2. One hole for balance purposes not to exceed 1-1/4
inch diameter.3. No more than one vent hole to each finger and/or
thumb hole not to exceed 1/4 inch in diameter. This
hole may not exceed 1/4 inch at any point through
the depth of the hole.
4. One mill hole for inspection purposes not to exceed
5/8 inch in diameter and 1/8 inch in depth."
It appears only the width is restricted.
You can go as deep as you want (that''''s what she said)
but more often than not, I think 3" is the deepest you''''re safely reccomended to go. Vise IT as well as Switch Grip, thumb systems both are just sightly over 3 inches deep.
--------------------
Mega Friction 78x3x47 278
Virtual Gravity 47x4x40 272
Red Death OTW
Jigsaw OTW
Siege OTW
FS/FT N''''Tense LevRG
FS/FT Twisted Fury
FS/FT The Sauce
FS/FT Jigsaw
FS/FT Black Widow Solid
FS/FT Kinetic Energy
Edited on 3/11/2010 5:12 AM
