Hi John
I used a home-made A frame (3" aluminium poles 12 ft long) to raise the mast on my 275, and found it a real battle. The stresses on eveything when it got to about 30 degrees made my wife walk away in terror. I had to nick the mast from a passing Topper to push it up past the critical angle, and was very glad it was a windless day. I wont try it again!
Good luck
Tim howard