Howdy got notification you were looking for a method. Well I used THIS>>>https://www.homebrewersassociation.org/forum/index.php?topic=1746.msg130227#msg130227
And Yes they do make 2 holed stoppers I had to do a lot of google searching finally found one.
It is white silicone. Sorry can't recall the source.
I assume you have a couple kegs? Fill one with CO2 gas and use it to Carefully push the beer
from your cask into a receiving Keg. If you get too much pressure it will eject your 2 holed
stopper. I found it easy to hold one hand on the stopper until I got the method down.
Word of caution Joe, when you put the Beam into an acrylic racking cane/tube, the alcohol
may cause the plastic to craze and crack to smithereens. Best to use glass, s.s., or copper tube.