is to apply some grease to the mainspring. Not a whole ton, but certainly more than just a thin coating. When I've done it I've applied enough excess to cover the outside of the spring and so that there's been a little of it between the coils here and there. I've done that to three Gamos and it's pretty well eliminated the twang. I'm not a fan of tar, but there are probably some here who will argue for it.
As to the trigger, I know I've seen some diagrams online, including here on this forum, so look around some and you'll see it eventually...or someone else here will link you to the string.
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