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Hi Allan,
Interesting idea! But how to fill the tubes..(without big mess)?
After some considerations:
A tube (36ml) has a diameter of ca.25mm. Now I would take a pipe (plexi or copper or somewhat with thin wall) diameter a bit under 25mm and a volume of min. 70ml. (2*36)
By cutting in the middle (long axis) I get two similar "sumps". One is my mixing part with measuring scale etc.. (divider is something that fits, like 50 cent or so) other is my part to cover it. After doing the mix, press the second (clean) part over the other one.(reunite)
Join together with rubber or band. Now we have a "loaded weapon". One thing is still missing: something that fits in the pipe to push the mix in the empty tube. Ready! I think , you have only a few parts, easily to clean and it works without mess. A big "injection"
Really you can looking for a bigger medical injection. After few cuts is ready to use .(and has a scale)
I hope it was understandable.( oh my english)
Cheers.
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