Purchased complete new reproduction roller assemblies for our clients '68 Hardtop. Have difficulty maintaining alignment adjustments to door glass. There seems to be excessive play of the rollers as they ride in the track assembly. Before condemning the new roller assemblies and related new hardware, wondering if I am overlooking something? Also interested in knowing if anyone has found a particularly good quality reproduction of the quarter window roller/ hardware. Are some manufactured better than others? Thanks for any help with this situation.