I'm using the original bontrager seat post that came with the bike, i'm possitive it's the correct size, 27.2mm. I also checked for weight limitations before buying it from the guy; this is what the website says:

• Max rider weight of 300lbs:
• All other bikes, including hybrids, urban, commuter, fitness, Ride+ electric assist, cyclocross, and all mountain bikes.

Things are sort of different here, most warranties will be honored for one or two years regardless of the stated duration (you will be blamed for any problems that occur after that period), dealers are not very commited to the brand; trek dealers here always deal other brands and most definitely will not honor the warranty if i'm not the original owner, which i'm not. So, that's pretty much out of the question.

Quite frankly i don't think i'll ever be riding this frame with confidence again; failure might not result in catastrophe, but i'd rather not risk it; i think i'll take the advice from FBinNY, davidad and aramis and just move all my components to a new frame that fits my height better so the weight doesn't cause so much stress on the seatpost (AND SHED SOME POUNDS! do I hear you say? hehe)

thank you all for your opinions!