If you have the insert out, you should be able to compres it all the way with your body weight , might be slow, and it should push out again to its full length also quite slow.
Are you sure its Bilstein HD ? Whats the part number?
There are Bilstein club sport (also called Rennen I) and Rennen II, they are very stiff.
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Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
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