the red seal is probably an Aussie custom seal - search the net for custom seals australia and see if they match.
like this ?
wow - that's big ** Not actual size
preload - minimal. barely touching the end block before you start screwing is not unusual, but certainly unlikely to be more than 1/2"
you really need a chrono when changing springs on an HW80.
TbT kits are good value, but if your spring is fine, just re-use it.
Last edited by Shed tuner; 07-03-2021 at 12:02 PM.
Reason: typos
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.