I bought this FJ40 with the engine (2F) apart and now have most parts reconditioned and the bottom end back together. Presently I'm trying to put the rocker assembly back on the head and I'm having trouble putting the bolts back through the assembly holes. I found that I need to rotate the sleeve and align the grooves in the tube. I've managed to get 5 of the 6 in but the last one (at the end) won't go in. Has anyone else had this problem, should I be looking at filing the groove a bit to allow the bolt to fit?