I have had good luck covering smaller models with 21st Century Microlite-an excellent and easy to use iron on. Also, Merlin Glowplugs makes a drop in high compression glow head and clamp ring that when used with a timing shim between the crankcase and cylinder give considerably more poop to your Cox .049. They are almost identical to the old Glo-Bee after market glow heads-I am lucky enough to own a couple of those. One is on an earlier Baby Bee with the double ports and open exhaust and it is a SCREAMER!