Stingray string mutes

[rubis]

I am in the middle of a build at the moment and will be using an aftermarket Stingray style bridge but adding the bridge studs and also a string mute kit, which has just arrived today. The string mute kit looks like this and has the thumbwheel adjusters. [attachment=149918:thCA3TYQXG.jpg] I will need to put in some threaded inserts for the adjusters, but looking at pictures of old MM bridges it seems they are machined away on the top to allow for the string mutes, as you can see in the second picture [attachment=149919:B8.jpg] My question is, are they machined away underneath too, which would make more sense to me as then the mute assembly won't be lifting the front edge of the bridge up (albeit by very little) Any help would be great