Gideon,
1. $85.00 they charge you for regluing the bridge is very cheap. I take it that they did not remove the bridge but just slip some glue in the lifted area and clamped it down. If they heated the bridge, removed the old glue, clean the contact surface and reglue it ..then the repair would be more stable. But its better to dry the guitar up with a dehumidifier first before doing the reglue- as you will be dealing with the real cause of the problem(Humidity) rather than the symptoms.
2. The causes of bridge lift is due to- HUMIDITY HUMIDITY AND HUMIDITY...once the guitar absorb moisture over a period ..the top wood will swell and the bridge area will swell...your action will go up and the tension stress on the neck will be much more...this pulling effect plus the swell curvature will stress and first allow the wings (pointed corner to lift) then if nothing is done..the whole bridge will start to lift more.
I've done numerous reglue of Baby Taylor(many of their bridges will lift over time reason no tonebars below the x-brace its a design problem) and other taylors..
here is my detail repair..after drying it and having the swell removed..then ..
Removal of the old glue with my scraper, also using a special solution to remove whatever oil or debris on the contact surface ..this prep work increases the sucess rate of the reglue process..
glue is spread out nicely and evenly..
clamped and reglued and then the action on the saddle needs to be lowered and neck adjusted for the new setup..
Honestly...Steven from Sinamex is a great chap and he is knowledgeable. That price $85.00 he charge you is very reasonable.
Cheers
Jarvis
guitarsaddle@hotmail.com