[Elecraft] toroid enamel wire question

[Eric Ward]

A quick question for an experienced (or anyway, confident!) builder: I am winding the first toroid,RFC14, for my K2 and seem be be inadvertently stripping a bit of the red enamel off the wire when I sew it through the toroid.  I don't remember having this happen with the KX1.  It appears that the inside edges of the ferrite toroid are kind of sharp.  I can avoid it by being EXTREMELY careful while winding.  Does it matter if a tiny stretch of insulation is missing?  I.e. should I start over whenever I encounter this?
TU es 73
Eric N0HHS
KX1 #670
K2 #6106 (in process)