Thanks greazzer, that is true. I'm hoping to find a rebuildable core, I can do the service myself.

We will see what happens

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I do not 'believe'. I have no use or time for this distraction. A'priori is antiquated furniture that clutters the mind and deteriorates society. Instead I investigate, research, scrutinize then choose from data what best serves as a suitable answer until a new idea or material is presented. Then I start the process again.