Quoted from RoninBJJ on his thread "First build-Graflex 2.0 Saber Kit" starts here "The info I have been able to gather so far is that the ID of the grip 1-5/16" (1.3125")."
It seems you will have a little wiggle space about 0.05" (that's if you round the 1.3125 and subtract that from 1.25) you should be good maybe you could use the plastic tube as well!
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