Stuck on Hard level 2

[Calastigro]

also, i must commend you on the impeccable taste it takes to have a Tom Waits quote as your sig.  he's a great man.

[Calastigro]

i've been banging my head against this one for days, but i'm having trouble building good suspension bridges without rigid joints.  anyone care to explain their solution?  

Thanks in advance.

[Calastigro]

darnit.  i was trying to be too fancy.  shows me.

[Calastigro]

There!  now i've finished the last levels of hard.  

now, just to get a feel, how many of you guys use the other materials?  like, in the last two hard levels i used only iron, with the exception of one steel link in hard 4.  

Haven't tested it too extensively, but click http://homepage.ntlworld.com/chillum/pfx2/hard02.jpg" target="_blank">here for a spoiler.