We are currently using the 2.5'' platter swap tool sold by Salvation Data (we got it 3 years ago). I think it is the most common in DR market.
The problem is that with some 2.5'' WD disk, we are not able to remove some of the platters because the space between the platters and the disk cover is too tight for this tool.
Is the HDRC tool good? (http://www.hdrconline.com/platter-exchanger-tool.php
Which tools do you use for 2.5'' platter swap?