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Old 11-20-2019, 11:10 AM
Eben Horton Eben Horton is offline
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This is just my opinion but you shouldn’t judge a jack by its durability but by its workability. You want a set of blades that heat up quickly and hold wax.
Ivan Smith made his blades out of medium carbon Sheffield spring steel. He personally told me this.

If you blow glass properly you should not wear out your blades in your life time. The worst habit (and I have seen many English blowers do this) is to grab the punty rod with your jack blades to apply the punty to the bottom of your piece. This will wear your jacks out in a year of doing this on a regular basis.

If you make blades that are built to be durable the working properties of the steel on the glass may be less than favorable.
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