Have just come across this post as I was looking for photos of an F500 to show my colleague.
I have an F500 F1 as bought direct from Pace many moons ago; it was their team race bike and I bought it off them at the end of the season. I love it. Very similar to yours but with the HEDs and big uns, it also has the chain retainer that loops over and under the front chain ring as described earlier in this post.
It has been hiding in my shed for many months now as the arrival of my little baby girl has robbed all my time! However this forum has prompted me to act. I will get it out over the weekend and give it service. Will post some images as soon as I get it cleaned up.
Excellent, cheers Chris! Perfectly understand your priorities but would be keen on seeing more when you can. Also like the Pace chain ring, I have had plenty of the earlier traditional form pace rings but never managed to get one like that.
I have managed to get a couple of closer shots that should give you an idea of how the chain retainer functions.
The bottom part of the retainer caps over the bottom bracket, I'm not sure if it's a locking ring or a grub screw that keeps it in place, I'll have anothe rlook and find out. The arm with the roller on it is adjustable by sliding it and locking it in postion with screws.
The top part of the retainer screws on to the swing arm. Screws 1 and 2 in the picture show how the adjustment is made either nearer or further from the frame. Screw 3 is used to adjust the roller, getting it closer to the chain ring.
Hopefully this helps,
Let me know if you need further pictures I can PM them over. I will try to take the unit off and get some shots of it off the bike however this may have to wait a couple of weekends as I don't have much time at present.