The hydraulic tensioner needs to be compressed much slower than that - a half turn of the vice/clamp every 5 mins. Should take 30 mins or so to fully compress - any quicker and you may damage it
Glad to see that I'm not the only one who does the belt & braces stuff - and that you've trumped me!
I'm not doing my cam seals as they seem ok. I am doing the tensioner though due to its importance - even though I have never heard of one fail
