ha, i see your point, the reason i made it out of fibre glass is so because i have easy acces to it and once iv made the mould it only takes 5-10 mins to make (depends on how much catalyst i use), and if you add up all the wieght iv saved by making things like boosters, tensioners, spacers, brake mounts and so on it does all add up, and if i break one of those items i can make a new one in 10 mins for free... yipee and no ive compacted the tensioner so that that its realy tough, sniff and it shouldnt crack under an impact either, ive been useing it for 3 days and still no damage... itll do... lol