Use these to modify a round oar for D-Type oarlocks like the Douglas Oarlock.
In the photos below, you can see that there are flats on three sides which align against the flats on the Douglas Oarlock to let the rower know he has the proper angle for either feathering or pulling.
Made of rugged, flexible plastic
These sleeves are designed to fit on a standard 1-3/4" round oar shaft.
To put the sleeves on your oar shaft, slide the cover off as shown below on the left. Then slide the sleeve over the oar shaft and replace the cover. If your oar has a larger loom and the sleeve won't slide down the shaft, it can be spread as shown in the photo below, right.
The rowing or stroking flat of the sleeve should be set parallel to the tip of the oar blade.
Martinoli Sleeves Installation: Place your oar in the oar fixture or place the blade on a level surface. Mix the BondoÂ® according to the instructions on the can. Remove the top plate from the sleeve and using a putty knife, apply the Bondo to the inside of the sleeve, coating evenly. Push the sleeve onto the shaft (the tapered end pointing toward the blade) by pressing the slot to the area of the shaft where the sleeve will be placed. Once the sleeve is around the shaft, attach the top plate by squeezing the sleeve together and sliding the top plate into the grooves. Twist the sleeve until the top plate faces upward (note: the blade should be held level, at 0 degrees), and place the pitch meter in the middle of the sleeve. Adjust the sleeve until it reaches 0 degrees, and let dry. When the adhesive has completely hardened, insert the 3/32 or 7/64 drill bit into the electric drill. The side of the sleeve on which the hole will be drilled depends on whether your oar is port or starboard. Place the oar over the edge of a table so that the blade hangs off the end, the edge of the blade vertical. The sleeve should be in the correct position for the hole to be drilled. Mark a point roughly in the center of the sleeve, the smooth part facing upward, and drill through both the sleeve and the carbon. Insert a #6Ã3/8 inch stainless steel set screw in this hole, and repeat the process for the second oar.