Visslo F8 premier Operation Manual page 30

is not stopped throughly.
Warning
Be sure to close sliding cover certainly before start edging.
Edging may not be able to be worked as sliding cover is not closed.
Don't open sliding cover during edging.
The operator may be able to be injured eye by the edging frictions simply
because the edging is not to be stopped though sliding cover is open
during edging.