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prime focus new telescpe


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hello need a bit of help i have this telescope Revelation 16" f/4.5 M-CRF Truss Dobsonian (Black) it works perfectly when viewing but when useing my phillips spc900 it will not focus it will  with a barlow lens but not without. now i understand i need to push the primary mirror forward but can anyone help me with how to push it forward like what would the best way to go about it i was thinking of cutting the trusses down a little bit would that not put the primary mirror closer the the secondry and focuser but not sure of how much to do it and not long had the scope and dont want to kill it haha if anyone can help that would be great thank you

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