Hi again
if at all possible try welding it on if that fails try the screw on method
u may have to weld a piec to close one end off before tapping it in.
a dye set is usually used to make a screwing on thread.

once u have sealed one end weld a hex nut in centre and then make a
coresponding thread on lip to screw onto nut

good luck

"Ruyi" wrote in message
ups.com...
thanks for your reply, should i just wrap the gaff onto the sides? any
idea how do they mount the gaff inside the pipe.?