DIY Roller Speargun. Guide to converting your Gun.

#Video of the entire DIY Roller Speargun conversion process at the bottom

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 1. Read the DIY Roller Speargun instructions before you start. Yes, all the way through!

Manny Sub Power Roller Conversion. DIY Roller Speargun

Step 2. Remove the screw holding the original muzzle. It may be corroded in so you may need to use penetrating lubricant. Mine was so tight I had to use a block of timber and a hammer to tap it out.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 3. Mark the barrel for the required length reduction. Skip this if you’re not changing the barrel length.

 

Manny Sub Roller Power Head. DIY Roller Speargun

Step 4. Cut the barrel to the required length. It is important to make sure the cut is square to the barrel so the power head fits properly. If using a drop saw make sure to use an aluminium blade. Otherwise a hacksaw will do the trick.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 5. Sand the inside of the barrel to remove any oxidation or foreign matter to ensure a good seal. It is also important to file any sharp edges to prevent damaging the plug’s “O”rings upon insertion. Filing the outside edge of the cut will prevent any annoying sharp edges.

 

Manny Sub Roller Power Head Conversion

Step 6. Lubricate the inside of the barrel and the power head plug with marine grease before installing into the barrel.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 7. Use a twisting motion to insert the the Roller Power Head into the barrel. Twisting will prevent damage to the “O” rings and ensure a good seal.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 8. Align the Roller Power head with the rail. I used the spear in the trigger mechanism to make sure everything was aligned. The power head may sit proud of the rail but this will not affect accuracy or flight path.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 9. Turn the gun over and measure 8mm back from the conversion plug. Mark the hole and use a centre punch to get started.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 10. Drill the 3mm hole.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step11. Screw in the provided screw and the muzzle is fixed into place.

 

Manny Sub Roller Power Head Conversion

Step 12. Remove the screws either side of the handle and and drill out the holes with a 5mm drill bit to accommodate the new handle-pin and anchor bushes.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 13. Drill out the screw holes with a 5mm drill bit for the new threaded handle pin. This pin will hold the line anchor bushes.

 

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

Step 12. Put one of the line anchor bushes on the threaded handle pin then push the pin through the handle. Next put the other line anchor bush on and tighten the nut with and 8mm spanner. Cut the remaining handle pin off  flush with a saw and file smooth.

 

DIY Roller Speargun

Handle pin and line anchors in place and your DIY roller speargun is done.

Manny Sub Roller Power Head Conversion. DIY Roller Speargun

The front end of the DIY Roller Speargun with Manny Sub Roller Power Head installed rigged and ready to go.

So, there you have it, a converted 1.2m Rob Allen Tuna. Now a 1.1m Manny Sub Roller Power Head. It’s a simple process and the plans are very clear but it’s important to read the whole document before you start.

Here is the entire Roller Speargun conversion video guide

Also for more information, tips and techniques read roller speargun Part 1 or Part 2 Roller Spearguns here

If you are interested in looking more at the MannySub Roller Speargun conversion kit head here to Adreno and save $20 by using the NOOBSPEARO discount code for spends over $200.

Cheers, Turbo

Written by Turbo

Turbo

With his background in Environmental Science and passion for the marine environment, Turbo offers a unique and often humorous insight into Spearfishing.

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