Thetford Aspire Service Manual page 24

The Grill Burner, continued
Using a stanley knife or similar
cut through the silver insulation
tape holding the insulation
cover to the grill box. Gently
pull the insulation cover through
the cooker and clear the top of
the grill box of any 'debris'.
Using a thin flat headed
screwdriver or similar carefully
prize off the two starlock
washers holding the grill burner
spigots to the box roof.