Cam Pre-Tensioners for Timing

[Gelbster]

Heiko -thank you for sharing your good work on alternatives to buying 3 x Porsche 9599 timing chain pretensioner tools.
Your comparison of the new/old tensioners indicate a 12%+/- deficiency in the old ones. I presume this is potentially significant in terms of an increasing probability of camshaft deviation with more future miles on the old tensioners.
Does anyone know the official wear/performance standards for the old tensioners?
If the old tensioners usually need to be replaced at say 80k-100,000 miles, then your re-purpose/modification of the old tensioners is a brilliant use of a worn out part. I can't even find a price for the 9599 pretensioner tool-even if I did want to buy them!
Interestingly, Porsche switched to a compressed air-operated tool for chain tensioning on their current V8 engines. The generic version of that tool is available for about $70 but I found no evidence it was interchangable with 9599.
Thanks again for sharing Heiko.