trombeur, thanks for the reply, machine is 150 miles from me in the middle of mohave desert, let me try and explain. the spring is broke towards the front about 6" from adjustment point where grease gun goes on left rail. the most forward lower roller is missing its double flange, bolts are sheered off i might be able too replace with good unit but have to removed whats left of bolts, thought about retracting adjustment enough too put roller in, some how i will have to raise track on left side, also adjuster seals are blown and idler needs attention with hard facing, heavy machinery is not new to me been around it most of my life since i was around 19 y.o. so at least 40 years driving and wrenching on big rigs. got a 50 ton press, jacks and large tools,air compressors but machine is way out there 7 miles north of barstow ca, and all tools are in town. just thinking it would be easier too just remove complete rail and more or less rebuild it because all the drilling and tapping and welding that needs to be done, transport to and from site is close to 2k thanks for the vids anthony