McCaughan on a passage by Feser

Gareth McCaughan responds to an argument of Feser's that I put on this site. I presented it without giving it a full endorsement, however. I had, however, been presenting a number of Feser's arguments with some sympathy, but I am a ways away from giving the argument in question my full endorsement, simply because I do think it's a tricky step from conceivability to possibility, as exapologist points out in his reply.