OK, need some help here. Installed a Rivera Primo Brute III belt drive on my 84 FXST. I was told that it would work from Primo. Now the starter bendix doesn't extend far enough to engage the ring gear. Called Primo and they couldn't help. Also called J&P, who I bought it from and they can't come up with anything either. Seems like I need a longer jack shaft if that could be possible. Any thoughts or suggestions?