This case press offers the best inexpensive case closer available.  Features include:

Exclusive straightwall nylon dies will not scratch or mar crystals.
Cast metal press to ensure strength
Assortment of fourteen dies (seven hollow and seven flat) to allow for all size watches.
 (Please note: The 18mm hollow die uses the 16mm flat die when closing smaller watch cases.)
Snap-on system allows dies to snap on and off quickly.
Face-down configuration means the repair person sees the case back being closed.
Complete instructions included.