Originally Posted by Star
There are two types you can buy in Syndey Spring Loaded Sprind Type ( Cedar at DJs as already suggested. Nice smell and ok value for money) and a Screw Type ( See the shoemaker in the strand arcade). The latter swore that he threw out his stock of Springloaded shoe trees as he believed they stretched the shoe too much if kept continually under a spring tension. Probably not an issue if your shoes are tight or snug fit however if your shoes are 1/2 a size too big you probably should go with screw type.
fact: my shoemaker (Zee's in HK- search tags) said his leather shoes won't stretch sideways, but because of the leather and construction, it definitely will stretch a bit lengthwise.