On my 83.5 the stove grate is secured by the frt & rear center legs that go
thru holes in the stove top. Pull forward and up on the front leg and it
should come loose and then it's easy to get the back one loose and remove the
grate. Reinstall it by hooking the back leg in it's hole, pull forward on the
frt leg and drop it in the hole.
Hope this works for you.

Tom Smith
83.5 Westie
Charlotte, NC