just a heads up, this is not true. confirmed by phattpiggie above ("the bocote and olive do not come to pieces") and vgoodiez to me in email. you also cannot remove the wooden collar from the standalone TA unit.
Edit: ah from vgoodiez product page:
*The Olivewood WPA and Bocote stem have a fixed heater matrix that cannot be removed. If you want a heater that will go on any stem then you'll need to purchase the heater matrix only.
My bad guys, and thanks for looking out @rollerskater
Makes my choice more easy - and more affordable