"RichardS" wrote
Make sure the switch can be locked on - it seems that a trend (no pun
intended!) in the lower-end routers is for non-locking switches, which
IMHO actually makes the tool more dangerous for handheld use (you can end
up in contortions trying to hold the switch down whilst working round a
piece) and also makes it pretty damned useless for mounting in a table.

EN50144-2-17 - particular requirements for Router
20.11 A router that is fitted with either:
- a spring loaded base which protects the cutten when not in use, or
- a self-closing guard which is not lockable in the open position,
may have a mains switch which is lockable in the "ON" position.

All other routers shall be fitted with a mains switch which switches off
automatically when the operating means is released.


Some brands (eg Bosch) get around this by supplying a U shape metal clip
that will fit over the switch and lock it on for use when mounted on a
table (with NVR switch). Doubt the Challenge one has such a clip - you may
find a cable tie or a jubilee clip does an adequate DIY job. this would be
more sensible than opening the tool and rewiring to bypass the switch.