I haven't used the JLCPCB hand loaded parts before but this time I had some sockets which they will solder in.   This incurs a "Hand soldering labour fee" of $10.50 and a "Manual assembly" charge of $18.20 which are both fine.  But the five different sockets involved also incure $15 in Extended components fee which it says is a charge for changing the feeders on the Pick & Place machine, but of course these parts go nowhere near the P&P machine.  Is this a mistake in the charging calculations, or is it in fact a fetching from stores charge in which case I'll try to reduce the number of different sockets used ?