Two questions

Question 1. I am buying a set of Turbo fins for the Outback and plan to put the fins and fin masts onto the Sport. Sport drive is V1 Outback is V2, are the fins and masts interchangeable between the 2 drives?

Trouble is my wife was peddling twice as hard with regular fins to keep up. I would like to put turbo's on the Sport for her but have heard that the V1 drive well is not as robust as the V2 and may develop a crack if turbo's are used. Is this correct, the Sport is 5 -6 years old. If turbo's aren't recommended I will put square tips on instead.

When reinserting the mast, pre mark the flat spot (see below) so you'll know when it is facing the Allenhead screw.

Tap it to make sure it is fully seated. If it is wobbling in the sprocket, you should either replace the sprocket or apply epoxy to stabilize the mast (or risk having the mast fall out when you least expect it). Locktite your Allenhead lock screw in and make sure it is fully seated -- check the other one while you're at it. Screws that are not fully seated (left, below) or that back out are the primary problem areas with this style of mast. You can tell by the final depth of the Allenhead screw. The above picture shows the screw properly seated.

---------------------incorrect-----------------------------------------------------correct-------------------------

On new V-1 sprockets, the Allenhead holes may not pre-threaded. They can be a bear to install without a power driver! The reason for this is that the older screws could get loose and back out. These stay in place much better, once you get them threaded! Be sure to thread them in all the way into the notch.

The new holes are tight, but the masts will fit. This is to insure a snug fit. THEY SHOULD NOT BE REAMED IN ANY WAY! Once the mast starts wobbling, it will eventually wear out the hole.
Here are a few tips that may be helpful:

1. Make sure the hole is clear of plastic shavings

2. Pre-mark the flat spot on your mast with a sharpie so you'll know where it is when the fiat spot is hidden.

3. Use a little soapy water to help the mast slip in (the soap will leach out later).

4. Using padded pliers, twist the mast as you insert it. When you get it in as far as you can, line it up (with the pliers if necessary) using your mark and tap it a few times to seat it.

5. If your screws are loose, now that the dealer "fixed" them, use a drop of Loctite blue to keep them in.

6. When you think the screws are tight, try rotating the mast with pliers. Tighten the screw until the mast no longer rotates, but don't over tighten.

7. If the screw is recessed when finished, you did it right. If it still sticks out, the screw may be hanging up on one of the ledges (if there is an option, I use the single flat spot; if the flat spot is split, I file off the middle ledge, as my screws tend to hang up on it).

With practice, it's easy to know what to look for, but the first time, it can be difficult to get it right!

Here's some more info on installing the "V-1" Turbofin masts:

Now here's the thing, the masts on the Sport drive are held in place with a split pin not an allen screw, does anyone know what version of drive this is?