With the Crank Sprocket, pick out the middle of all the Keyways. Get and old Sprocket, put it on top of the new one, line up the Keyway in the old with the one on the new you've just picked out. Get a felt tip marker and put a Dot on the new where the Dot is on the old. It doesn't need to be spot on, just within 1/2 a tooth is fine.
Do the same with your Cam Sprocket, only as that has 2 slots, just pick out one, put a mark next to that, the using that keyway, do the same as above.
Then when changing, the sets I've used, the Crank Sprocket Keyways were 20 apart. So when changing, pick out the new Keyway you'll be trying, rub off the previous mark and run through that procedure again. If I recall right, from that middle keyway on the Crank, those in an anti-clock from that advance and those in a clockwise direction, advance. I've not come across the Cam Sprocket with 2 Keyways, but I'm guessing they are 10 apart.
There's a bit of trial and error with them.
I've tried these, the vernier, slotted type and off set keys, my personal preference is the latter. I found these with the multi-keyways painful, I hope your experience is different.
,,,,,,,,, as it saves having a handful of different offset keys to having to wait for one to be delivered once you know what you need.
Ages ago, I bought 2, 4, 6 and 8 degree off set keys, which worked out a similar cost to the adjustable types. Most of what I build these days, within 1 degree is good enough and I can do that with these 4 keys. Having them on hand means no waiting and once fitted, if further adjustment is needed, I have that next key.
Then between builds, what ever I've used, I put on the next order.
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