You will find an installation video at shaveroutlet.com. See link below and scroll down for video
http://shaveroutlet.com/shaver-replacement-parts/norelco-philips-hq8-spectra-sensotec-replacement-heads-p-251.html
If the reason that yours will not go together is because of broken parts, you will find replacements for model 7310XL at the link below
http://shaveroutlet.com/catalogsearch/result/?q=7310xl
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Are the heads falling out or is the plastic frame that holds the heads falling apart?
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