Repairing dials
Many dials become sluggish after a while, usually through dust and/or over-lubrication in the past. If you are lucky they will respond to a drop of light oil on the insides of the governor cup and on the governor worm drive. Try not to use WD40, but if you do then only a quick squirt. If this fails then you will have to do a full disassembly job (tedious!), followed by washing in white spirit. Afterwards lubricate the re-assembled item with watch oil. Maplin and other electronics component shops sell a micro-spout oiler containing oil and Teflon particles for a very moderate price.
If the problem is a broken spring, this advice from Steve Hilz will help. “You can rewind dial springs by carefully pushing the mainspring into the holder and working it into the centre as you go. You have to watch out that you don't let the spring release, but it will go back OK with some patience. Wear gloves so you don't cut yourself. If you have a broken spring near the end, you can anneal it in a flame and let it cool gradually. Then, make the bend that you want to be permanent. Then, reheat the portion of spring that you annealed, until it is red, then quench it in cold water to restore the temper.”
Usual dial failures are:-
1. Noise - lubricate governor cup.
2. Slowness - lubricate governor cup and dial central spindle.
Central spindle can become packed with oil residue - complete strip
down to cure this.
3. Dial not returning - spindle seized or return spring broken -
complete strip down.
Tips:-
1. Dial speed - dial the digit 0 and on it's return say
"one - one thousand and one" at normal speed.
2. Broken dial spring - generally all GPO dial springs from the No.
10 - 54 will work in any dial.
Dial 10 - 11 adjustment Document
Dial 12 - 30 adjustment Document
Last revised December 26, 2006
FM2