I only use one tree on the first two strings. I locate it across from the fifth string tuner. I drill the hole after stringing, but before tuning up. Leave strings slightly loose, place the tree on the two strings push it down and scribe/awl a mark for the drill hole. I compensate for the break angle on the third and fourth strings by winding more string on the tuner. IMHO - Tremolo and bending work have better chance of staying in tune without the second tree, especially considering the wound fourth string.
_________________ Tom Krebs
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