I have several Dremel 'clones' and have replaced the collets with small chucks off Ebay on 2 of them without any issue- they seem to be the same size as the Dremel shank (or quill, if that is appropriate for a hand held drill) and therefore the most common. (8mm dia from memory but certainly significantly larger than the other common size, at this scale.)
I bought a third, rechargeable, one from Lidl recently which has a smaller diameter shank- after measuring it, I took it to be the other common size of 7mm x 0,75. However, after some supplier issues, when one finally arrived this morning, it is a 'gnats' too small to fit.
There only seem to be two sizes- to fit 8mm and 7mm shanks (or quills), with the same thread pitch (0.75), so I don't think it is measurement error.
Has anyone successfully replaced their collet(s) with a chuck on the Lidl Parkside (especially the rechargeable) multitool, please, and can advise the size they used.
(Why a third one? for a portable took kit.)