i actually think it was just cut too short at some point. this is a pretty unimpressive resin kit, which was what got me thinking about the real parts. i may try to get the stir stick at some point too.
the resin one i have matches up everywhere, but is about an inch and a quarter shorter than the measurements on the tutorial here.
Some smaller photography shops in the uk stock the paterson squeezee for less than you will pay on ebay I managed to get mine for £10.00 from a place in basingstoke, the stir stick was £4.00