It does work. Tested already. I have. 3/8-10 g10 pin and it fits just perfect. If your pin is longer (i saw a few) might not go all the way...but again they are rare...if you tell us the maker of your cue maybe somebody will chime in with a 100% sure answer.
Now...not trying to derive you from buying a BR ext but everyone I asked was unhappy with the length and weight of it...Btw there are a few cuemakers/repairmans that can build a custom one (of your exact specs) for maybe 10-15$ more...just saying..
Hope that helped.
Chris@2015
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