The Precision Freewheeler, ready to install, weighs 8 grams with an 8" prop and 9 grams with a 9.5" prop. This is only 3/4 gm heavier than your old system if you include a small Crockett hook.
If you are retrofitting an old model, simply remove the existing standard 1/4" (6.3 mm) nose button and enlarge the hole to 3/8 " (9.5 mm). Apply a small amount of either white glue or an acetone-based cement like Duco or Ambroid and press in place. (Don't use CA as it may wick into the mechanism rendering it useless.)
There are three adjusting screws in a tripod arrangement. These are accessible from the front with the nose block in place and may be adjusted using the included Screwdriver/Anchor Pin. The total adjustment range is 10 deg. in all directions. One complete turn of any screw adjusts the thrust line approx. 2.5 deg. I like to install the Gizmo so that two screws of the three screw triangle are across the top, then by adjusting only one screw, I get both down and side thrust at the same time. It's amazing how precise, fast and easy trimming becomes.
The removable Sleeved Clevis, which twist locks onto both the Front-End and the Winder Attachment for winding, is designed to handle 2 to 8 strands of 1/8" wide rubber, although Orv has been able to stuff in ten strands of 1/8. Make sure the pin head is firmly pushed under the tab so the pin does not realease and cause the rubber motor to snap into the back of your model.
This depends totally on the motor's length and number of strands. The tension-sensing Spring causes the Gizmo to lock up and go into freewheel when the motor tension goes down to between 55 and 60 grams. In other words, the tension between the Front End and rear peg is always the same regardless of the make-up of the motor.
After winding the motor using the Winder Attachment, slip the Hex Key/Anchor Pin through the Hollow Clevis Pin. This allows you to anchor and hang on to the fully-wound motor while you disconnect the winder and reconnect the Front End.
One of the neat features of the Gizmo is that you can wind your model and leave the Front End locked up. This means that you don't have to hold the prop (just like the Wakefield guys) and you can leave it on the stooge while you wait for a thermal or go for refreshments. When you are ready to launch, use two fingers to pull the prop forward into the Spinner/Dog and hold it there while you turn the prop three turns clockwise (viewed from front). Give the prop another two turns clockwise to ensure that the Gizmo is in the correct mode and you are ready to fly.
In the factory, props are checked and adjusted to a high performance
1.25 to 1 P/D (pitch to diameter); however, we do not balance the prop. Instead,
we include a strip of lead foil tape which the customer should apply to the
light blade tip in instances where contest rules do not permit scraping the
heavier blade. Simply trim off narrow strips of the tape until the prop is in
balance. This process is fast and easy to do - and the silver color of the tape
blends in nicely with the color of the prop.