I bought a rain gauge for the garden. It consists of a long steel stick and an upper part that holds the jar. The upper part is merely put on top; there is no screw thread or anything to stick both parts together. Thus, the upper part can easily rotate.
I am looking for ways to prevent that rotation without adhering both parts forever (because we might want to disassemble it again). It'd be okay if the rotation is not completely prevented, but needs much more force to do so. The goal is to avoid unintended rotation (e.g. by wind/weather or touching). But it's also alright to prevent rotation completely.
The space between stick and upper part, when put together, is very small. Liquids can move into the gap, but solids (like adhesive tape) must be very thin in order to fit inside.
It must be possible to adhere the upper part to the stick when the stick is already sticked into the ground in the garden. (Reason: The thermometer on the upper part is delicate, so I can't risk having it on top when I force the stick into the ground.)
Things I tried:
- adhesive tape around the stick: doesn't work. Either it doesn't stick so that it just moves downwards when the upper part is put on top (with force). Or it sticks well and the upper part just doesn't go over it.
- electrical tape put inside the upper part: it is thin and flexible enough so that it's possible to put both parts together, and if I use the right amount, I can move the upper part down as much as intended (with force), and rotation needs more force to occur. But only until I rotate once or twice - then the tape is squashed enough so that there is not much difference to no tape.
Things I thought about:
- hot glue: put stick into intended position in garden, then glue some hot glue on the upper part of the stick, then quickly put upper part on top. But I don't know if this can be done fast enough before the glue becomes solid, since the stick is outside in autumn/winter and made of steel.
- silicone: allows adjusting everything without haste since it takes ~48h to dry. But will it stick to steel? And will it even dry? It's between two layers of metal and no air can move in or out!
- screw a horizontal hole into both parts (when put together), then use bolt and nut to prevent rotation. theoretically the best option. But it requires me to make no mistake, I have only one try. Also, I have metal drills but I don't know if they work in steel. The rain gauge wasn't cheap!