Professor Fate said

Don't try to shorten your spacer- just get a shorter one. New or place an ad on the forum for a used one.
https://www.ebay.com/itm/389957660704?_skw=1/2"+fan+spacer&itmmeta=01M08WFKGTP8XZXFBY9RN7ZXA4&hash=item5acb49b020:g:mi8AAeSwh5lp85L0&itmprp=enc:AQALAAAA0GfYFPkwiKCW4ZNSs2u11xAgo3L17J7oHakGSzxyET+HtIzFLGSkNErP43Jwa7qlAZXEnDl5x2SZseljdDklmVVkYvRf/oecUAgAXO02N1IcHPLUbF4KTR8HpkZ7TUIaluSOZq5hw3XHmzS8EWFcJVQcQEf5I7jxRILEP15bnepJbflJd5e+QCTkbM0hQiUElbwC/YW9zFtqowrNbWpFv/vDoAlw1SN+VSO+7i2z3IEeGYIyL6XPAott2gZ/x9eZRwJpKXH0Oh/CCtq3Gcc16rQ=|tkp:Bk9SR8i4vpyCaA

For heaven's sake, don't try to bend the fan!! you could weaken the blades or throw it out of balance trying to do that- and you don't want to see what happens when a blade fails at speed...

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