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The Bintel focuser is a re-branded GSO. If you search for reviews on the GSO crayford, you should find plenty.
I remember reading such reviews when looking for a crayford for my 'scope. I eventually chose a more expensive brand, partly for payload, partly for upgradeabilty and partly to get the larger flange size for maximum FOV (which shouldn't apply to you due to the narrower baffle exit on the C9.25).
I don't recall anything particularly bad about the GSO reviews - some mention of cosmetic wear on the barrel comes to mind but that's about it.
Another option is a Feathertouch microfocuser in place of the main focuser knob - I'm pretty sure they would make one - but, personally, I prefer the Crayford approach.
As for the screw - there are plenty of sources online (eBay, hobby shops) if you know the exact size.
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