A sma' leak will sink a great ship.
As menseless as a tinkler's messan.
As merry's a mautman.
A smith's house is aye lowin'.
As mony heads as mony wits.
As muckle upwith as muckle downwith.
A's no gowd that glitters, nor maidens that wear their hair.
"It was the fashion some years ago (1721) for virgins to go bareheaded. The proverb means that everything is not so good as it appears."—Kelly.
A's no help that's at hand.
A's no ill that's ill like.