Best tool for chain ring bolts?

[Shut Up Legs]

I'm trying to tighten the outer bolts on a large front chain ring, i.e. the bolts that are hollow, with a groove on the outer end that faces towards the crank. I was using the Park Tool CNW-2 tool, but it's bloody useless, because the bolt keeps moving when I use an Allan wrench to tighten the matching inner bolt. Any suggestions?

 

[classic33]

How tight are the actual nut & bolt compared to one another?

All I've ever used is an old screwdriver in the slot to hold the inner(hollow) bolt in place.

 

[Shut Up Legs]

Never mind, I managed to tighten them. I need to find more suitable tool for the hollow bolts, though.

 

[Soltydog]

I replaced mine a while ago & was looking for an appropriate tool, but all seemed to have poor reviews. Best tip I got from elsewhere on here was use a small coin, I found 5p ideal for the grooved side of the bolt

 

[SatNavSaysStraightOn]

my largest flat head screw driver is not wide enough to cover both sides, so I use a piece of flat metal that is a corner brace for something or other... cost about 20p from the DIY merchant and is a triangle with various holes drilled into it. Works really well.

 

[SS Retro]

Shimano chainring bolt tool only costs a few quid worked fine for me.

 

[SpokeyDokey]

Buy chainring bolts that use an allen key on each side