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I recently had this problem myself. When I looked into it, it seemed that a number of things can cause it: overfilling the basket, tamping, not tightening the moka pot properly, worn-out rubber seal, etc. It made such a mess that I wasn't in a rush to try it again. However, after reading about your experience I just had another go and it worked perfectly.
Method
-grind 14g of beans in porlex on setting 4 (this turned out to be too much coffee, by about 6g!)
-fill moka pot with boiling water to below the valve
-fill the basket with ground coffee and level off using the back of a butter knife, do not tamp
-spill ground coffee everywhere but catch most of it on the a kitchen plate
-using a tea towel around the bottom, tighten the moka pot as tight as you can
-stick it on the gas hob on full flame but turn it down to the lowest as soon as the coffee starts coming out of the top
-remove the moka pot from the heat as soon as you see/hear a change in the flow and put the bottom in a bowl of cold water
-enjoy your coffee without needing to clean the entire kitchen afterwardsYou might struggle with an electric hob but good luck!
Neddos-
14g? What size moka?
I use 23g for a 3-cup.
Sound technique though.
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Used it again this morning with much better results. No hosing! Everything was the same except I'd cut the faulty bits of aluminium out so the two holes on both sides of the stalk bit were actual holes, rather than high-pressure sprayer nossles and I used 7 on the hotplate instead of 9.
I just spoon pre-ground coffee in until it's near the top. No tamping, maybe I'll tap it, maybe I'll smooth it a little with the spoon but mostly it's just dumped in.
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Not tamping, putting boiling water in the bottom, dropping the heat when it starts to come through and taking off before it splutters and running the base under cold water - made a huge difference for me. Can't believe I used to make these daily for years and I was getting it so wrong.
NotThamesWater
hippy
Nef
Wow, the hole side basically came out. Looks like it was a manufacturing issue. This should help!