[autoavia]

Chris I had seen your neat, well engineered modification before but our club rules only allow the drop arm to be locked and a guide movement restrictor so I had to find another way.

 On the Lotus I used a bolt through the front body mount and though an existing hole in the drop arm. I don't have anywhere to cut metal at present and my metalwork skills aren't very good anyway so I used wood to make up a guide restrictor. The front of the restrictor fits over the collar that carries the guide post and I drilled a hole for the bolt that locks the drop arm to stop any movement. I was also worried that a metal one might short out the braids.

 On the Chaparral I couldn't use a bolt through the front body mount to lock the drop arm as the bolt fouled the front body post so I epoxied a wood block in front of the slot in the body mount and screwed into the block through a hole in the drop arm. The only downside is locking screw for the drop arm has to be taken out to get to the front body screw. The guide restrictor is the same as the Lotus.

I must admit it isn't the most elegant solution but it looks like it will work ok.