Re dropping a kli in the Mikva by tevilas keilim: (
http://forums.dansdeals.com/index.php?topic=17387.msg791654.msg#791654)
The Ramo paskens that tevilas kelim does not need kavana. A koton Need's supervision just to verify the tevila.
R' akiva iger (in 120) is mesupak whether one may make a brocho after the tevila. He references the Eshel Avrohom in 323:7, The case is: someone receiving a glass from a goy on Shabbos. Ramo says to do a tevila by filling it up with water, so that the tevila is unrecognized. The MA comments that no brocho should be made, as this would make the tevila obvious. P"m discusses the option of making the brocho post facto. Interestingly, He basis the assumption that this is possible on the machlokes in y"d 200, if all tevilas are like tevilas ger and therefore the brocho is said post facto. (IMHO a big chiddush to stretch this to keilim)
The biur halach, when discussing the MA in 323:7, suggests making a brocho while the kli is still (fully) submerged.
This implies that, while he does not mention the chiddush of the PM, he would be OK with making the brocho post facto if the tevila is still happening.
Bottom line, IMHO, it would come out, that if one drops a kli in the Mikva, the best suggestion is to leave it submerged and make the brocho.
This is just for discussion purposes, ask YLOR!