For difficult glow plugs I use a small 'telescopic magnet' to remove/fit the small nut for the elec connection,sometimes if I am lucky I get it started on the thread first time !! but I dont usually drop the nut.
I sometimes push a piece of small bore plastic hose over the threads to help remove/fit the glowplug,once again using this method usually avoids dropping the plug.
As JOR said we all have different ways of doing things and of course different engines give different challenges.
I also test the new plugs prior to installation,my 440 ones measured approx 1.1 ohms between the body and the connection thread.
cheers baz
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