I'm overseas in Korea and everything is 220 instead of 110. When I put the 110 converter on my trimmers it makes a very loud noise.

You can not fix the noise if you are using the outliners outside of the usa because even though you are using a transformer to adjust the voltage it doesnt change the hertz and that is what makes it make that noise.....just open the clipper up and fill it with sponge. Mainly around the top of the clipper....it has to be enough to stop the motor from vibrating so much without putting so much pressure on them the blades cant move quickly. after you have done that you may find that the noise will stop depending on how tightly you have screwed the casing back together.....it may take a couple of days of using the clipper and allowing it to heat up a bit for the sponge to mould around the motor. but at the same time using this method will amost definitely effect the performance of the trimmer. if i were you i would bite the bullet and ditch them and perhaps look at a trimmer thats manufactured for countries outside of the u.s.a.......i know the wahl lithium beret is a very sharp blade but doesnt have the t blade....i would still recommend the beret over a t shaped blade like the wahl detailer because it is sharper