Technical information

Practical A.E.G Upgrade 2006
Page 71 Copyright 2005,06 The AirsoftPRESS (Hong Kong). All rights reserved.
The long variable-pitch spring is very difficult to install. What should I
do?
What can I do to reduce stress on the gears?
On most Version 2 mechboxes you can find a hole at the back of the mechbox
which allows you to see through to the spring guide. You may insert a long and
thin screwdriver, through the hole, into the butt of the spring guide. Just push
downwards on the front of the screwdriver to keep the long spring in check while
you close the mechbox. Most version 3 mechboxes do not have such a hole at
the back :<
Spring rotation can reduce stress for the gears only if both ends of the spring are
free for spinning. As a cheap way to facilitate free spinning of the spring, you
may use a ball bearing spring guide as well as a ball bearing inside the piston.
Take your piston to a local bearing shop and get a bearing that can fit into the
inside of the piston perfectly. When both ends of the spring have ball bearings,
free spinning can be significantly facilitated. Do remember that:
 a 400fps+ spring may be too tough for most ball bearings – they may be
cracked.
 ball bearings do act as a sort of thick spacer – if you have them on BOTH
ends of the spring you may experience gun lock-up. We recommend this
configuration only for the hard and short type upgrade spring.