the seals are 31.9 and my seat tube is 31.6, already tested it and im using a full length seat tube to push it down, just sealed it all together with silicone and im going to test that its water tight before i put it in all the way. only putting it about 5mm below my cutout so i can clean out any dirt easier. also going to use silicone and "weld" the sides of the o ring to the sides of the seat tube... i got this
fair play, seems like a bit of an annoying design to be honest, like those cutout head tubes, one dudes steerer rusted through without him realizing until he stacked and the bars just came off
Good idea for a fix though, to be honest if i hadn't already sealed my seat tube from the bb side i would probably run one to stop water getting in the bb
Personally i would have put something like expanding foam down there instead (just saying)