The mount for suspension legs is often a very tight affair with steerable bow retracts. Often, only a short
steel pin is inserted from above into the appropriate receptacle, on which then from the bottom a steering arm is placed. On the rest of the steel pin then a suitable landing gear
leg with appropriate hole and side set screws is placed.
At the other end of the steel pin a broadening prevents the pin slips down out (see sketch).
Schematic lateral cut of a steering nose retract
The blue steel pin is inserted from above into the bore of the gray chassis and attached from below with the orange
steering arm. The broadening at the upper end of the pin prevents it from falling out of the seat.
At the same time, the hatched area above the pin must remain free so that the retraction mechanism has sufficient room to move.
If you want to install another suspension leg - for example, a more stable version made of spring steel - it is usually
necessary to insert it from below into the hole.
The problem is now the lack of protection against falling out. A collar is usually eliminated because it is too big for this purpose and the retracting mechanism would not work.
As shown in the following pictures, we build from a few wooden blocks an auxiliary construction with a horizontal hole
in the same diameter as the landing gear leg. The auxiliary construction is fastened with clamps to the table top. The chassis leg comes into the hole and is attached
with two collars so that it can not move in the longitudinal direction, but still can be rotated.
Before that, you attach a multitool (eg Dremel) with a thin cutting disc horizontally in a suitable drill stand and align everything as seen in the pictures.
Now you can very easily with only little pressure and uniform rotation mill a uniform, fine groove just before the end of the chassis leg, in which later an open spring ring is used for securing. Then you also can mill with a different grinding attachment a notch for the steering arm, so that this later can not twist so easily. However, care is required because this notch must be located on the right side of the chassis leg to match the wheel mount. Otherwise, the steering arm could later be at an unfavorable or even improper angle to the steering direction.
Now all you have to do is insert the spring strut from below and push it through until the spring ring can be inserted comfortably. Then pull out the spring strut as far as possible and fix the rudder lever from below.