by Ananda Ranasinghe, Los Angeles O Club
Punch stands are available from various O vendors. For example, Scarborough Orienteering offers a lightweight aluminum stand complete with SI unit holder at a low cost. However, if you wish to build your own, these instructions can offer you some guidance. If you have suggestions to improve the design, please contact the webmaster, who will add your comments to this page.
Note that these instructions refer to, and the photos show, the older-style control unit holders (for BS7 and earlier SI units), but the instructions can be adapted to the newer control holders (bracket for BS4-7 or plate holder for BS8) using a little ingenuity.
|1/2" diameter PVC pipe|
Pin-punch support (see note below)
Control unit holder support
|1/2" PVC T-joint||Joins upright, holder support and pin-punch support (see note below)||Hardware store|
|SI control unit holder||Holds control unit||Orienteering supplier or SportIdent|
|Two 1/2" #6 flat head slotted wood screws||Attaches control unit holder to 6.5" PVC support||Hardware store|
|#12 screw eye||Attaches control flag using lanyard hook||Hardware store|
|Lanyard hook||Hooks control flag to screw eye||Craft store|
|Pin punch||Used as backup in case SI unit fails||Orienteering supplier|
|Control flag||Orienteering supplier|
|One 1/2" #6 slotted pan head machine screw||Attaches pin punch to shorter PVC pipe (see note below)||Hardware store|
|Cable tie||Stabilizes pin punch on PVC pipe||Hardware store|
|10" long tent stake||Use tent stake with a narrow head that fits in 1/2" PVC pipe||Sport Chalet is one vendor of narrow stakes|
|2-3" piece of fuel line||Keeps head of tent stake 2" above ground surface||Auto parts store|
|PVC glue||Affix support pipes to upright||Hardware store|
The tent stake is inserted in the fuel line piece, which keeps the head of the tent stake 3-4" above the ground, then inserted into the ground.
The PVC upright slips over the head of the tent stake. A cross piece holding a pin punch, control unit holder, and a screw eye is placed on top of the upright.
The control flag attaches to the screw eye by a lanyard hook. The SI unit is clipped into the control unit holder when in use. The pin punch is a back-up device in case of failure of the SI unit.
NOTE: The original design with the pin punch on 5" PVC pipe can be subject to breaking in the case of too much force used to press the punch. Though many such stands have survived without breakage, you may want to attach the pin punch directly to the T-joint that sits on top of the upright, or design some other way to strengthen the pin punch support piece.
All the parts
Cross piece detail
Flag attachment detail
Last update: March 27, 2007