I’ve just completed my first ‘tune’ of a springer and the results are pretty pleasing. After my Gamo 440 suffered a broken spring I obtained a Maccari spring and lubes (parts listed below for reference). While waiting for these to complete their transatlantic journey to South Africa I took time out to make a spring compressor, basically following Charlie’s design but adding a few touches of my own. I have put some info about the spring compressor on a local airgun forum I belong to and if anyone is interested the link is:
http://www.airrifle.co.za/forumdisplay.php?s=56f18f2de4aab2b8b7fbe9b99c3d42da&f=2448I had little difficulty taking down the air rifle and doing the de-burring and the lubes largely thanks to Charlie’s excellent notes from the GTA Library. This Maccari spring is intended as a ‘drop-in’ for Gamos so I used the stock top hat and lower spring guide. In practice, however, they are not a snug fit with the spring and this is something I would like to improve on. I’m getting the springer tuning bug. I’m not a machinist and I would have the top hat and spring guide machined for me locally. I would appreciate any info on this GTA members could give me. I would also like to tweak the trigger a bit if possible (it already has the GRT111 which is a huge improvement). It’s the Gamo parts I would like to sweeten to make the trigger pull a bit smoother and lighter. Again, if anyone can offer advice/pics to do with this I would appreciate it.
With the new spring, de-burring of parts, and the lubes, the Hunter 440 feels like a different gun. I tried it out and before finishing zeroing the scope properly I shot a few targets, off-hand at 15 metres. This was the my best result (attached).
The GTA is a great community and I appreciate the advice and information that have come my way.
Maccari Parts:
Spring: E-3650 Prod. Code: E3650
Apex Seal: Prod. Code: APV 65798
Heavy Tar: Prod. Code: LHT432
Moly Paste: Prod. Code: MM657
Ol’ Mick