Have just completed a valve grind on the RGS rep (not my favourite job!) and naturally used the comb to position the push rods as I lowered the rocker box. However, while the comb is useful it's not perfect so I thought I would raise this topic to discuss the process.
1) I fitted the spark plugs into the head to avoid anything dropping inside during the struggle and found that the comb needed a notch in it to clear the plug. This worked out fine and you might want to modify your comb since I found that this also helped to keep the comb in position in one direction...up to a point...
2) I find that the weight of the push rods, the SRM steel ones, push the comb, and hence the rods, forwards out of position so I had to hold the comb in position with one hand while struggling to lower the rocker box assembly such that the push rod ends located in the rocker cups. Does anyone have any ideas on how to keep the comb in the correct position without holding it while getting the rocker box assembly down without nudging it out of position? I was thinking about how much easier it would be if the comb stayed put.
Cheers
Alan