I've broken every types of rear needle valve brackets wheather they're metal or plastic.
The LA's metal bracket being not so thick will vibrate a bit more..but it didn't effect the engine.
I actaully like the way OS designed it becuase i can rotate the needle assembly to have the
needle's head pionting up instead of stick out on the side.

The only thing i don't like about them is sometimes there's not enough room behind the engine,
depending on a model. And when I mount the engine side way the fuel tubbing has to do wierd
bends.

Generally i can refuel through the intake line if it's a regular needle valve.
If it's a real needle..and not wanting to mess the tubbing, I refuel through the muffuler's line.
I just have to crank harder.lol Sometimes I flood my enigne.