Excalibur crossbows

[Talon]

I mentioned earlier that I'm not a fan of Titan springs in older guns . I'm not . They really did use softer springs back in the day . The Titan is a quality Spring though and will be fine in a rifle like the 80 . Just fitting a Titan will get the rifle well over the limit .
I suggested you buy an aftermarket spring to store Broom . It really isn't worth the risk of having an unregistered firearm while the rule of law still applies , by all means fit it and see what power its generating . Then remove it and store .
The big problem with an 80 is keeping it under the 12ftlb limit . The single most important item you should own after getting an air rifle is a chronograph . Not only to ensure you're legal ,but to test results after any work carried out and to check the results of different pellets . A chrono is an absolute must and you can pick a barrel mounted one like I have for £50 . It's a must have purchase , especially in a country like ours with strict air gun laws . Ignorance is no excuse in the eyes of the law and the HW80 has a well known reputation . More than any other springer in the uk and the police are well aware of it .
The standard Weihrauch Spring and piston seal are both very well made . Mort mentioned Tinbum kits . I have one in my HW99 . And a Tinbum top hat in my .177 Webley mk3 . I highly rate them .
There really is a vast wealth of knowledge on the net regarding the 80 Broom . Tinbum kits and springs are available from eBay .