If you are uncertain about whether you need the euro-pin or US-cup style of extension - give us a call at 727.656.6569 so we can help you get the right parts!
Chinook Aluminum RDM Mast Extension
These Chinook extensions are the "skinny" version, made to fit RDM (reduced diameter) masts and fit a euro-pin (single center pin) or us-cup (2 side pins) style mast foot. The aluminum alloy is lightweight and durable and the EX power-haul pulley and cleat system is time tested. The adjustment is via a collar and pin system and is fool-proof.
The short size gives you up to 12cm of extension, medium is up to 28cm of extension and long is up to 38cm of extension.