http://www.bigeye.url.tw/big5/d_pk18_55.htm
(in Chinese, English Translation Here (machine-translated).)
The lens is fully dissected and the functions of different parts of the lens are explained. Really interesting.. Btw, it can also be seen how the design of the DAL is "simplified", just say, even now infinity focus collimation is not possible with this lens, but just it was checked and fixed at the factory, one-off and "discretely".
Read Also:-
Exploded View Diagrams of the K20D and *ist DL
Disassemble the Top Part of a K10D