Thingiverse

Key Bow - Impugnatura Blockshaft by DrGeeky
by Thingiverse
Last crawled date: 4 years, 1 month ago
This is a replacement bow for a blockshaft key, but it can be used for other keys which have a shoulder of 2.5mm. Actually you can safely block it by using a pair of bolt and nut, even though the square bore is quite tight.