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56C ringer.
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14th Nov 2018, 11:20 am
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Neil1970
Retired Dormant Member
Join Date: Oct 2018
Location: Northampton, Northamptonshire, UK.
Posts: 10
Re: 56C ringer.
It might be a 3BA which is 4.1mm o/d or a 4BA which is 3.6mm o/d. If it's 3.6mm o/d you should be able to tap out to M4 or if it's 4.1mm o/d you might be able to tap out to M5 if it comes to it.
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