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You should be fine with a collimation cap as you are at F/6 and collimation isn't super critical. I have a 10" F/4.7 and I also use a collimation cap and the center spot on my 10" primary. I made my own out of a film canister cap. I drilled a small hole and placed a reflective ring on the underside of the cap.
To finalize my collimation, I line up both rings.
Just make sure the lid on the back of the scope is off to let a bit of daylight through the back of the mirror so the center spot on your primary is viewable, (just be careful that it is not a sunny day and the sun can be seen).....I fear the dangers of a bright sun anywhere near my telescope or primary mirror. I will do this on an overcast day in my back room with my bright blue curtains shut.
Works for me.
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