regarding the regassing - you are best to buy one and keep it with the gun - that way you can fine tune it to your liking - they can make good power but you may find a little lower is fine for what you need it for and the improved shot cycle and cocking effort is worth the drop. have a look at Best Fittings in UK. they have the fitting for charging, and likely a slim jim pump, but there have been a few cheap pcp pumps on trademe recently that may work better.

I have a Theoben Eliminator, its a beast - heavy, solid, beautiful! big cocking effort but its 27 footpound. could be dropped to 20fpe and smoothed out. 

I have a Sirocco - early 1984 example. stacks pellets and around 22 footpound so not so hard on cocking and shot cycle. trigger lets it down a little as the webley trigger is a bit behind the likes of weihrauch. 

I have another sirocco as well, later model with thumbhole stock. its a bit of a wreck with a broken and repaired stock, but it has a shorter carbine barrel than the early sirocco

The one gas ram id want would be the SLR 98 carbine! im a sucker for an underlever! 

Check this Hard Air Mag article on HW90 Pressure setup:

And there's other good stuff on how to do this out on the Net.... well worth the effort!  

I took the stock off last night, took one look at the machining and workmanship and there's no way I'm putting my sausage fingers and technical illiteracy to work on such a fine firearm.

Is there anyone in the country, other than Ron Young and, particularly in the South Island, that you educated folks would trust with this?

Or does someone down south here have the Weihrauch regassing connector that I could borrow? 

Small world eh?!  We're 5km from Bunnythorpe!!! 

You are most welcome to come over when you're up here - I have two air rifle ranges (70yds and 140yds), all kitted out for shooting (wind flags, distance pegs, safe range-ends, dry firing areas, etc) so bring your weapon(s) and plan for a day of fun!

I'll PM you now with my details...

Cheers, Myson.

That rifle is still a tack driver after 12+ years and it is one of the old models before they were fitted with  regulators! 

I'm continually amazed at the accuracy and at 32fpe, she still knocks magpies down at 140yds!  I have the wonderful Hawke Sidewinder 30 on top.

To keep both my S510 and my S410 in good working order, I use one for 6 months then swap over to the other for 6 months..... seems to work well.

Both rifles like the AA Diabolo Field 16gr pellets - or the Edgun 16gr pellets....

I have his number if anyone wants it.

https://collectorweapons.co.nz/product/3649f3ae-34a5-4ea7-a67e-760e22caf7ad