18-11-2018, 06:58 PM
The ringing test works on crockery but based on a pile of cracked Seven cranks, useless. If reduced to a donk very seriously cracked. Have to be free of any other dampening factor; grease etc.
I have timed the ring on apparently good Jowett cranks and varies greatly (although these do come with various heat treatments)
I purchased a gallon of black not ultra violet fluid 45 years ago ago " for use with a Benault portable detector". A bit of a fiddle for an amateur to use, but only use a few drops at a time. .I supect it is just fine iron dust in kero.If such a basic product still available a Club may be able to purchase and dispense in small (shielded) bottles. Might be able to make with fine emery paper!
I have timed the ring on apparently good Jowett cranks and varies greatly (although these do come with various heat treatments)
I purchased a gallon of black not ultra violet fluid 45 years ago ago " for use with a Benault portable detector". A bit of a fiddle for an amateur to use, but only use a few drops at a time. .I supect it is just fine iron dust in kero.If such a basic product still available a Club may be able to purchase and dispense in small (shielded) bottles. Might be able to make with fine emery paper!