Spotline V2: Installation

Mounting the Spotline V2

Be sure to test basic functionality prior to installing the Spotline into locations that may be difficult to access or troubleshoot!

Mounting Holes and Bolt Patterns

Fastener Requirements

  • Minimum 4 connections, ½” grade 5 or better fasteners

  • Two (2) different adjacent hole sets with at least one set being on the drum side

  • Washers required between fastener and square tube

  • Locking hardware required

    • Lock nuts preferred

    • Lock washers acceptable for lags

  • Ensure that under full and dynamic loads, the winch will not move or begin to loosen

Standalone Installations

Mounting Directly to Floor

Required Hardware

  • 4 @ ½” x 4” Lag Bolts (Recommended length is 2 x thickness of held material)

  • 4 @ ½” Lock Washers

Mounting to Unistrut Rail

Mounting your Spotline to Unistrut (or any other type of runner) not only gives you a little bit of flexibility in the direction of the runners (either front to back or side to side), but gives you an outboard method of securing to the deck or to some form of counterweight.

Required Hardware

  • 4 @ ½” 3” Hex Bolts

  • 4 @ ½” Lock Washers

  • 4 @ ½” Unistrut Nuts

  • 2 @ Lengths of Unistrut

  • 25.5” allows 5” of Unistrut protruding off the front and back of the Spotline

  • 47” allows 5” of Unistrut protruding off either side of the Spotline

Mounting to Truss

Required Hardware

  • 4 @ ½ Cheeseborough Clamps

  • 4 @ ½” Bolts (appropriate for the cheeseborough)

  • 4 @ ½” Flat Washers

  • 4 @ ½” Lock Nuts


  1. Bolt the half-cheeseboroughs to four (4) corners of the front, back, top, or bottom of the Spotline tube framing. Be sure to follow the bolting guide for proper placement.

  2. Note the hole spacings for various truss widths

  3. Secure the cheeseboroughs to the truss

Mounting to Counterweight Plate

Required Hardware

  • 6 @ ½” x 3.5” Flat Head Bolts

  • 6 @ ½” Flat Washers

  • 6 @ ½” Lock Nuts

  • 1 @ ¾”(minimum) Plywood Sheet - Cut to appropriate size for adding counterweight

Spotline footprint is 37”L x 15.858”W


  1. Drill and countersink the underside of the plate where the bolts will go

  2. Install the bolts up through the bottom of the plate so they are protruding into the air

  3. Place the Spotline onto the protruding bolts

  4. Secure with washers and lock nuts

  5. Distribute counterweight evenly around the plate

  6. Test to ensure that the Spotline stays in place with dynamic loading and quick stops

[bolted to a large bottom plate]

Ballast Weighting

Not all venues allow for securing the Spotline to the deck or a piece of scenery or other equipment. In cases like these, it is still necessary to ensure that the machine is properly secure, especially when exposed to dynamic forces such as quick stops or aerial performance.

ANSI E1.21 - 2020 for temporary structures states that the weight of ballast required shall resist slippage and uplift with a minimum design factor of 1.5 times the horizontal and vertical vector reactions created by the applied line load.

It also contains really great resources for calculating ballast loads and requirements. While we're not technically installing a temporary outdoor structure, the calculation methods are the same and industry standard.


If you are uncertain about requirements, its ok to consult an engineer!

(that's what we do!)

According to our calculations engineers...

The MINIMUM BALLAST WEIGHT to resist a vertical rope off the Spotline is 3000lb


If the wire rope coming off the Spotline has ANY HORIZONTAL COMPONENT (I.E. it's not perfectly vertical), the required ballast increases rapidly and significantly.

To make a long story short, the maximum force under "abnormal operations" - such as e-stop, power failure, or essentially any other sudden stop - is 1880lbf.

1880lbf * 1.5 safety factor = 2820LB --rounds up to -> 3000LB Minimum Ballast Weight

We use two (2) @ 2' x 2' x 4' solid, concrete blocks for mobile shop testing

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