Even over in the pattern forum where a bloke asked about his header coming loose there were some posters that didn't even realise until well into the 2nd page (even after it had been mentioned on the first) that there are at least two different header types for that engine.

What amazed me were the posters that were still providing him "help" for the header he doesn't use because they didn't read (or couldn't understand) the earlier posts?

It is difficult sometimes being multiple countries separated by a common language relying on the written word to get a point of view across, but sometimes guys get so excited about being "right" that they don't even realise the other poster is talking about something completely different. One clear example is the confusion that happens when somebody tries to explain how they use scales to mix their fuel to obtain the desired volumetric ratios instead of a graduated container. Some guys just can't seem get past "scales" and "weight" before spouting off about the wrongness of it all. They know methanol is lighter than nitro (which is why it can't be done???) but it's like watching a chimp with a rock in one hand and a nut in the other that just can't quite figure out the next logical step which makes it possible...