Bicycle Mechanics - Threading rack eyelets

I have been using my new fixie to commute, and now I want to get a rack on it. I found some electrical C-clamps to use as seat stay mounts at home depot, and there are eyelets on the rear dropouts. The problem is that these eyelets are not threaded. They are about 6.5 mm in diameter (measured with calipers).

I can just bolt the rack to these eyelets, but it feels like it may shake around a lot and might break the bolts or eyelets. I would borrow a tap and put an 8mm thread on the eyelets, but all the racks I have use 5mm bolts, so I wouldn't be able to get an 8mm bolt through the rack AND eyelet.

Any suggestions? Is it silly to worry about this?

I have been using my new fixie to commute, and now I want to get a rack on it. I found some electrical C-clamps to use as seat stay mounts at home depot, and there are eyelets on the rear dropouts. The problem is that these eyelets are not threaded. They are about 6.5 mm in diameter (measured with calipers).

I can just bolt the rack to these eyelets, but it feels like it may shake around a lot and might break the bolts or eyelets. I would borrow a tap and put an 8mm thread on the eyelets, but all the racks I have use 5mm bolts, so I wouldn't be able to get an 8mm bolt through the rack AND eyelet.

Any suggestions? Is it silly to worry about this?Room to open up the bolt hole in the rack?

I have been using my new fixie to commute, and now I want to get a rack on it. I found some electrical C-clamps to use as seat stay mounts at home depot, and there are eyelets on the rear dropouts. The problem is that these eyelets are not threaded. They are about 6.5 mm in diameter (measured with calipers).

I can just bolt the rack to these eyelets, but it feels like it may shake around a lot and might break the bolts or eyelets. I would borrow a tap and put an 8mm thread on the eyelets, but all the racks I have use 5mm bolts, so I wouldn't be able to get an 8mm bolt through the rack AND eyelet.

Any suggestions? Is it silly to worry about this?

Just get a bolt and nut. Try and match the eyelets with the bolt size, if not no biggie really.

Just get a bolt and nut. Try and match the eyelets with the bolt size, if not no biggie really.
Make sure the nut has a nylon insert to keep it from backing out.

I think you are going about this the hard way. You want a rack. your bike has rack eyelets on it. You should buy a rack and install it in the eyelets on the bike. Problem solved. If there are no brazeon eyelets at the top of the seat stays then get a Blackburn rack, which usually comes with rubber coated stay clips and will come with plenty of screws and nuts, or ask for a couple of rubber coated rack stay clips from your LBS. These eyelets are not going to crack and break off, their purpose is to hold a rack on the bike.

Topeak makes these cool racks that mount on your seat post. If you have not seen them, I'd say they are worth a look. I saw one on a friend's bike (he loves it) and had to have one myself - and I love it.
They come in different sizes and there may be one that will meet your needs. Also, they are quick release, so you can easily take them off the bike.

Check them out here:

http://www.topeak.com/products/rack_beam_lead.html

I think you are going about this the hard way. You want a rack. your bike has rack eyelets on it. You should buy a rack and install it in the eyelets on the bike. Problem solved. If there are no brazeon eyelets at the top of the seat stays then get a Blackburn rack, which usually comes with rubber coated stay clips and will come with plenty of screws and nuts, or ask for a couple of rubber coated rack stay clips from your LBS. These eyelets are not going to crack and break off, their purpose is to hold a rack on the bike.
Okay thanks for the useful tips! I used some rubberized clamps from Home Depot as the seatstay clips, they seem to hold the stays very well. I'll just tighten the bolts up real good and not whine about it unless something breaks :)

Use Nylock nuts with a nylon insert; these will not come lose with vibration. Use washers as well.

Use Nylock nuts with a nylon insert; these will not come lose with vibration. Use washers as well.
Thanks for the tip! I'll use some blue loctite as well.