Try "pasting down" the comb in the desired position using two small
dots of "J B Quick Weld" from Lowe's or Home Depot, a quick setting
epoxy cement.  Get things all set and mix up a very small amount,
place a "dot" of the mix on each end of the comb bottom face and
line it up.

After a few hours try it out; if it works as wanted, use some clear
caulk to glue two screw heads in the unused mounting holes -- saves
making new holes!  If it doesn't play right for whatever reason, you
can pry the comb back off _if_ you didn't use too much epoxy.

Don Markl