The key dimensions are : support tube diameter = 27mm ( depends upon transom fittings) Overall length of support from foot/end of tube to Centre line of roller 1170 mm. The locking plate is sized 30 x 70 mm set 365mm above foot/end of support tube but to suit you transom fittings.
The roller is a standard trailer keel roller with bracket such as :
Park 21 mast support.pdf
(268kb) downloaded 28 time(s).
Hope this helps
I am also new to the parker 21 having purchased mine for the 2020 season but only getting a few weeks use which I very much enjoyed, hope you too are pleased with your boat.
, regards Rob Pierce
Those photos are great thanks. I don't have the internal brackets on my boat so I shall have to get them made up as well as the post and roller, but at least I can see what I need from the pictures.
Yes I bought mine last year too but didn't get a chance to use it as there was just too much to do before I could safely sail her.
I'm really sorry I haven't responded earlier but my priority has been work at home so I can get to work on the boat. That is just starting now with new rigging, so I hope to be on the water in a month or so,
I'm not sure I will fit in the locker, but I have a son who is a little more bendy than I am.