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If the epoxy elements are different viscousities, the circle thing won't be exact. A less viscous (runnier) substance will have less volume in the same diameter because it will be flatter. However with thicker epoxies, you cannot measure them with syringes. Guesstimating with the circle thing or with 2 lengths of similar size beads will probably be sufficient. I use the two 4.25 oz bottles of devcon 2 ton. I squeeze both beads out at the same time. I also am very careful to cut the new bottle nozzles evenly. With E tex, it is thin enough to measure with a syringe. So that is what I do. Eastman, use 30 min 2 ton. Mix it, gradually add either sawdust or micro-balloons until it is the consistency of putty. Then cram it in there with a putty knife or something similar. Remember that the working time of epoxy can be reduced by as much as 1/2 when you add that much filler. The epoxy will still bond very well with the wood, but you can tool it. Plus it sands easily.