The 510 Realm

what valve spring compressor should I buy ?

this:
http://www.ebay.co.uk/itm/Midlock-On-Ca ... 0153769732
or

this:
http://www.ebay.com/itm/Sealey-Valve-Sp ... 1597079803

any other options known ? lordco could not help

The second one has an adjustable angle for the handle. I made my own and originally had a straight handle. When I tried to use it I found I ran out of room to depress the handle without it being angled up.

did you use a hole saw to make the hooks ?

I don't remember. It doesn't look like I did, but I definitely should have. That part wasn't a problem, but I also believe I eventually cut a notch into the compressor piece similar to the notched replacement arm on the top version in your OP. Been a while since I used it, so details escape me.

I use the factory valve spring compressor that was available from Datsun Comp many years ago.

Looks like the factory tool has a much longer spring compressor piece, which would mitigate my angle issues. OP's top compressor choice with the spring compressor piece mounted in the tallest config might replicate the OE positioning.