the blacklight (UV) was wrt using it as an inspection technique
and the refractive oil to 'clear' a machined surface - though if it penetrates also the crack then such would not be visible
good tops can be made, but it requires a great deal of care
-> and over tightning a barb renders the best threading worthless
MDM
think Araldite, amine cured
roughen both bonding surfaces with coarse sandpaper
DO NOT TOUCH surfaces prior to bonding (oil from fingers)
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