Love, Peace and Harmony
I also tried Ø17-20mm with 1,5mm thickness and its not perfect, too.so i got a set of o-rings, sadly none of them are usable, they are all 2mm thick and that's too thick, no way I could force the wood over them. Anyway 18-20mm ID does fit well on the deck, 17mm or 21mm might still fit too, though that would not be ideal. Fortunately I've also found a small rubber ring that also does fit, and is thin and soft enough to be useable, I've only got 1 though, it's enough to hold it together. It's just soft kitchen rubber, so it will probably break very fast, so I'll try to not disasseble the musa anymore, the coil work well, no need to fiddle with it anymore.
I most likley found the correct size now. But I still have to aprove it. Its 16mm inner diameter, and thickness is 1,2-1,25mm. I am awaiting the arvial of the oringsdo you still have those? maybe take a photo of them next to to the proper ones from the deck, so I could have better idea, just make sure to make the photo as perpendicular as possible to minimize perspective. And what do you mean by not perfect? It's not possible to fit, or just very hard, but possible? I guess the softness plays a role too, because if they are too soft, then I ccan only put one on there on the upper groove, and it will move to the bottom one as I put the wood on, if I put two soft ring into both grooves, then they just smoosh on th bottom and it doesn't fit.