Let me take a look tomorrow but I think you're head is fine. Some pump drives require what is called a "long shaft" pump head but I don't have any personal experience with them. If it was working fine before something funky is going on.
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Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers.
Current Tank:
Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.
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