I don't know of a kit, but the main thing is to make sure your supports are the same length. Also, I usually take a cake board the same size as the top tier and make an imprint on the cake it will be sitting on. That way I know where I want it to sit.
what I do is,
take an extra cake plate or board which is the same size as the tier I want to place .
Rest it on the cake that i will be putting the tier on.
center it by eye and then measure it.
adjust it as needed and when i have it just right i will lightly push down to make an imppression.
then put my dowling in and place
Those are the things I am doing right now, but they don't always come out perfectly centered... human error I guess. After fretting over it, I think I have come up with an invention to solve this problem. I made a protype yesterday so I am excited to give it a go!
The guy I work with p/t at a caterer (we do wedding cakes), he told me to refrigerate the cakes so that they are solid and then it is easy to stack them. Once you get each tier stacked, you can eyeball it and then use a spatula to nudge the cardboard (under the tier) over here or there until its centered perfectly. The icing will be pretty firm so it won't squish, and the cakes will be more firm too and won't wobble. We actually do alot of refrigeration between cake steps (after crumb coating, after icing, etc) and it never hurts the flavor of the cake but it helps the decorating process immensely! Esp as at work we use a non-crusting BC.
Then when you have all of them stacked, take like a tip 5 and put a line of icing around the base of each tier and then take a clean finger and smooth it all around so that the cracks are sealed. It makes a perfectly centered and perfectly sealed cake ready to decorate!
I think the best way is to cut a hole in the bottom of the cardboard cake circle for the center dowel. Put your center dowel in the center of the bottom tier then lower each cake on top of the center dowel. That way they should be centered if you cut your holes in the right place. Just make sure that your center dowel is shorter than the combined height of you cakes!
Love to hear about your invention when you are done!
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