Spring gun tuning: Part 1
Spring gun tuning: Part 2 – Building a mainspring compressor
Spring gun tuning: Part 3 – Mainspring compressor continued
Spring gun tuning: Part 4 – Let’s disassemble a gun!
Spring gun tuning: Part 5 – Powerplant disassembly
Spring gun tuning: Part 6 – Disassembly completed
Spring gun tuning: Part 7 – Disassembly of other spring guns
Spring gun tuning: Part 8 – Disassembly of other spring guns, continued
Spring gun tuning: Part 9 – Cleaning and deburring
Spring gun tuning: Part 10 – Lubrication and reassembly
by B.B. Pelletier
Time to install the barrel. Lube the thin thrust washers with moly as well as the sides of the base block where they ride. That helps to hold them in place as you install the barrel. Connect the cocking link on the barrel to the sliding link in the piston, then carefully work the base block back between the arms of the mainspring tube. To get the base block aligned with the hole through the spring tube arms, the cocking link has to push the piston backwards, which is why we haven’t installed the end cap yet. You’ll have to realign the thrust washers on both sides after the base block hole is aligned for the pivot bolt.
The long cocking link is connected to the sliding link in the piston and the piston was pushed backwards to allow the base block to align with the holes in the spring tube arms. The pivot bolt passes through the left side of the gun. Don’t forget the two thrust washers!
Now, install the rifle in the mainspring compressor, allowing room for the end cap. Slowly compress the spring. As the end cap threads approach the mainspring tube, it’s important that they line up correctly. You can move the end cap in the headstock by small amounts to make the alignment. And, if you use the B-Square mainspring compressor shown here, you can also adjust the position of the barreled action. When the end cap enters the mainspring tube, start turning the cap to engage the threads. You have to gradually increase tension on the compressor as the two parts thread together. When the threads engage and the cap begins threading into the tube, continue to keep tension on the cap with the compressor. Don’t stop until a significant portion of the threads are engaged.
This is the entire barreled action in the mainspring compressor.
The end cap is under slight compression in this picture. As it comes closer to the mainspring tube, you have to make positioning adjustments to align the screw threads.
The bridge of the B-Square compressor has five bolts to finely adjust the position of the mainspring tube. Notice the leather belt I am using to protect the rifle’s finish. No precision here!
There will be more postings to finish putting the gun together, but tomorrow I want to give you a final report on the Remington Genesis rifle. I think I have some good news for Genesis owners.