Well, the LA series is also the most user friendly. I discovered real fast that you should remove the head screws one at a time and clean them then put a dab of locktite on them or they tend to back out. The air bleed carb is all but idiot proof.
The covering doesn't sink into any gaps, if it shrinks well it covers them and you can't really see them. Sometimes the covering will show a dark line where the CA glue was used.