If you can post some detailed photos of the linkage by using the tutorial at the bottom left of the page, it might be easier to suggest some modifications to what you've already fabricated, rather than starting over with something different. Usually a little bit of tweaking to an existing design can solve an interference problem. "Measure twice- - - - -cut once!"
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!