Tree Branch Pruner

I have an old Tree branch pruner on a fiberglass pole. The blade is not cutting completely thru the bark. This causes the cut branch to stay attached to the limb by the piece of bark that was not completely cut.
All tool sharpening shops I have called will only sharpen the blade. They tell me to disassemble the blade, bring in for sharpening, then reasemble the blade myself. I can disassemble but I am CERTAIN I cannot reassemble. The spring is too strong for me to stretch.
Can anyone suggest a company/store, near me, that will sharpen including disassemble and reassemble. I live in Van Nuys, CA 91402 which is near Los Angeles, CA.
New tool costs about $33 but tossing this perfectly usable tool is out of the question. Thanks, Dave_S
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Check the relationship between the blade and the bypass iron. I'm betting there's some space there that shouldn't be. The blade should close right alongside it. Tom Dave_s wrote:

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wrote:

Rig some sort of clamp to hold the spring in place BEFORE you take the blade off. Then just leave it there until you can get back to it.
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