Step 1
Download the file
Step 2
extract files Clock1 and Clock2, rename them Silver-Clock1 and Silver-Clock2.
Step 3
(Assuming you are using Windows XP) Go to your DROD folder (by default it's in Program Files), Head into the data directory, then the bitmaps directory, and place your Silver-Clock1 and Silver-Clock2 there.
Step 4
Head back to the 'data' folder of DROD, and open 'DROD.ini' in notepad. Find the line 'Clock=Clock' Change this to 'Clock=Silver-Clock;Clock' (without the single quotes of course)
Step 5
Play DROD!
If you want to change the clock ingame, simply click on the clock and it will change. Clicking on the clock again with change it, yet again!
Advanced
If you want to add more clocks, simply repeat the steps, only naming it (something different)-clock, and when adding it to the .ini, insert it and separate it from the other entries by a ;