[TR] SU Carb Question

[wbeech at flash.net]

Helping a friend re-build his H2 carbs and after disassembly I noticed that
the ring on top of the body, after removal of the piston/slide, has two
screws and two holes that vent to the outside of the body.  On one unit of
these the holes have been sealed up with JB-Weld(?) and the other unit has
the holes open to the atmosphere.

http://www.flickr.com/photos/7899895@N08/6578318551/
 
So, inquiring minds want to know, should these be sealed up or left open?
 
TIA for all the help!
 
Bill
 
Bill Beecher
'58 TR-3A TS30766L  "Tarbaby"
www.triumphowners.com/1566
"A Triumph is man's best friend, it always comes when it is called...of
course, some times it is difficult to make it go"