I just bought a new school Redline frame. Rear dropouts are for 3/8" axles and I use 14mm. I would rather not go to a slotted 14mm, but instead have the opening on the dropouts cut to fit 14mm. Has anyone had this done, if so what type of place did it, and is there anything special I need to know about getting it done? The dropouts are about 1/4" thick so I don't think I could do it myself, not that I particularly would want to try something like that anyway.

Bring it to a local Machine shop and see what they say. The hard part will be holding the thing while they mill the slot out.

I had two friends do this very thing, at two different shops. The first one was perfect (milled out). The second one was butchered and looks like they used a chainsaw (they actually used a grinder). The second guy will not admit it but I suspect his wheel is crooked in the dropout.
My point is be careful.
Brian D.

you have to do it evenly 1/8 off the top, 1/8 off the bottom...a steady hand, a marker and a good cutting tool will do it....or bring to a machine shop

Grab a sharp file!

I did that with a steady hand and a lot of hours on a Dremel Tool. I tried the file but didn't make much progress on the hardened chromoly.

My dropouts had a lot of extra metal. I just cut the lower side just to make sure the wheel would be straight when I finished. It came out pretty good.

Drummels work well on a lot of things. If I can make an educational guess - you bought that FS880? And I think those dropouts are rather thick??

Best beat, a machine shop - not a hacking one though - one that will mill it out for you - not "grind".

I have my brother do it for you, he's a machinist, but you are not around me....at least I don't think so....

Stephen
RL-20II Guy