Add Hole for Second Entrance - EZ Nuc

Often the standard (push/pull flex tab) opening works fine and suits my needs; however, sometimes I wished I had a real simple second entrance with a removable plug... or a round hole that would work with a piece of queen excluder to tape over it... or even better a dial-an-opening entrance wheel/dial that could be rotated to various position/settings to vent, exclude queen, full open, etc. 

PROBLEM:  Didn't like trying to drill into corrugated sign-board plastic with standard spade bits and risk possible chatter, burring, or worse.  Or trying to find my hole saw and running it backwards to make smooth hole.

SOLUTION:  I had some of the 1 1/2" dia. yellow plastic nuc plugs that come from bee equipment supply companies (often used in the entrance of waxed cardboard nucs).  Chainlink top line rail pipe is 1 3/8", but the coupler/connector had the O.D. that worked perfectly.  Heated the connector for about 15 to 20 seconds and used it to make a nice smooth hole in the plastic nuc (opposite end from standard entrance.  Now I can use either or both entrances.  Queen exclude the round and close the standard push/pull entrance, then later open the standard entrance back up and/or plug the round entrance.

WARNING:  Pipe is hot, do not touch with bare hands.  I used pliers, but assume welding gloves would work.