lens help

[Gonz]

I thought someone had posted instructions on cleaning/repairing pentax 
lenses here, but I could not find it.  I bought a cheap 50mm 2.0 lens 
off eekbay and I cannot get the middle element out.  The front two were 
easy enough, and the back two came out together in one assembly, but the 
middle element is puzzling.  Does anyone here know how to remove it?  I 
dont want to take everything off the back, but it seems that there is no 
option to remove it via the front.

rg