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those are variable inductor coils. I know about the LC tank that makes up the reciever filter. How ever doing the math, it doesn't add up to the center frequency of 27.145mhz of the car that I have. That is why I am looking for a schematic, I am sure there is another component of the filter that I need to adjust as well..
as for removing the solder, the solder sucking pen (I actually don't know the "real" name for it) works very well. I use it many times very useful.
But if you don't have one handy, you can use soldering iron and melt the solder and remove a little bit at a time (I MEAN A LITTLE BIT) do that if you are really bored or desperate to remove the solder.
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