Installing a bottom pull front derailleur on a top pull cyclocross bike.
So I inherited a Trek 7500fx from my dad, and it has some Sora STI brifters on a drop bar. Now I wanted to adjust the front derailleur because you had to hold the lever to get it into the biggest cog, turns out it's a Nexave mtn derailleur, and now it won't go between more than two cogs. I check this forum and it turns out Shimano road and mtn components don't mix (except rear derailleurs from what I understand), so I go and grab a Ultegra road derailleur at the local used store. As I walk out I realise it's a a bottom pull derailleur (duh!), and the store doesn't accept returns. So how do I go about solving this problem? I have only found clamp on pulleys for smaller diameter tubes (mine's a 34.9mm). Suggestions?