This elusive tool is almost impossible to find. I have looked for 4 years off and on and just located one! It is not here yet but I will post dimensions of it after I get it for those that need the information. After I use it I will consider loaning it out if someone just has to use it and not make one from the dimensions.
This is the BT-33-2 gauge that is the starting point for the TV rod adjustment and also the petal height. Most people just have to skip that step and hope for the best. I have had good luck not using it but will now be able to know it is correct